The code snippet in question creates and inserts an account namedMyAccountand then initializes a loop to add additional accounts.

The loop runs fromx = 1and continues adding accounts untilx < 10.

Since the conditionx++is post-increment, the loop runs exactly 10 times, creating and adding 10 new accounts to thenewAccountslist.

At the end, theinsertDML statement persists these 10 new accounts, along with the already existing account (MyAccount).

Total accounts in the org:

Existing accounts = 5

New accounts added = 10

Total = 15

Salesforce Apex Developer Guide

Salesforce SOQL & SOSL Reference

Why Usefinal?

Thefinalkeyword ensures that a variable ' s value can only be assigned once.

Option B: Assigning the value in the constructor is valid as it allows for flexibility when creating class instances.

Option C: Assigning the value directly when declaring the variable is also valid for constants.

Why Not Other Options?

A: Static variables can have their values reassigned unless marked as final.

D: Static variables cannot be assigned within a class constructor.

Why a Trigger on the Child Object?

Since the relationship is not master-detail, a trigger on the child object can perform aggregate calculations and update the parent Opportunity.

Why Not Other Options?

A: Tree sorting is unnecessary and unrelated to roll-up summaries.

B and D: Neither Streaming API nor Metadata API is suitable for real-time roll-up calculations.

Why Salesforce CLI?

The Salesforce CLI supports scripting for Continuous Integration (CI) pipelines, allowing automatic testing and deployment as part of the CI process.

Why Not Other Options?

B: Visual Studio Code is a development IDE, not a CI tool.

C: Force.com Toolkit is outdated and does not support CI processes.

D: Developer Console is for debugging and manual testing, not automation.

Comprehensive and Detailed Explanation From Exact Extract:

To determine which SOQL queries are safe from SOQL injection, we need to evaluate each option for how it handles the name parameter (user input from a Visualforce page) and whether it properly mitigates the risk of SOQL injection. SOQL injection occurs when untrusted user input is directly embedded into a query string, allowing malicious users to manipulate the query’s logic. Let’s analyze each option systematically, referencing Salesforce’s official documentation, particularly the Secure Coding Guidelines and Apex Developer Guide.

Understanding SOQL Injection:

SOQL Injection: This vulnerability arises when user input is dynamically concatenated into a SOQL query string without proper sanitization, allowing an attacker to alter the query’s behavior. For example, if name is ' OR ' 1 ' = ' 1, an unsafe query might return all records instead of the intended subset. The Salesforce Secure Coding Guidelines state: “SOQL injection occurs when untrusted input is concatenated into a query string, potentially allowing an attacker to bypass intended logic” (Salesforce Secure Coding Guidelines, SOQL Injection).

Prevention Techniques:

Bind Variables (:variable): Using bind variables in SOQL queries ensures user input is treated as a value, not part of the query logic, preventing injection. The Apex Developer Guide notes: “Using bind variables (:variable) in SOQL queries is the safest way to prevent SOQL injection” (Salesforce Apex Developer Guide, Secure Coding for SOQL).

Sanitization: If dynamic SOQL (e.g., Database.query()) is used, user input must be sanitized using methods like String.escapeSingleQuotes() to escape special characters (e.g., single quotes) that could alter the query.

Context: The name variable comes from a Visualforce page, meaning it’s untrusted user input and must be handled carefully to prevent injection.

Evaluating the Options:

A.

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String query = ' % ' + name + ' % ' ;

List < Account > results = [SELECT Id FROM Account WHERE Name LIKE :query];

Approach: Constructs a query string by concatenating wildcards (%) with the name variable, then uses a bind variable (:query) in the SOQL query.

Security: Using a bind variable (:query) ensures that the value of query (which includes name) is treated as a literal value in the LIKE clause, not as part of the query’s syntax. Even if name contains malicious input (e.g., ' OR ' 1 ' = ' 1), the SOQL engine treats it as a single string to match against Name, preventing injection. The Apex Developer Guide confirms: “Bind variables prevent SOQL injection by treating user input as data, not executable code” (Salesforce Apex Developer Guide, Secure Coding for SOQL).

Example: If name = ' Test ' OR ' 1 ' = ' 1, then query = ' %Test ' OR ' 1 ' = ' 1% ' . The SOQL query becomes:

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[SELECT Id FROM Account WHERE Name LIKE ' %Test\ ' OR \ ' 1\ ' =\ ' 1% ' ]

This searches for records where Name matches the literal string %Test ' OR ' 1 ' = ' 1%, which is safe and does not alter the query logic.

Conclusion: Safe from SOQL injection due to the use of a bind variable.

B.

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String query = ' SELECT Id FROM Account WHERE Name LIKE \ ' % ' + name.noQuotes() + ' %\ ' ' ;

List < Account > results = Database.query(query);

Approach: Dynamically constructs a SOQL query string by concatenating name.noQuotes() into the query, then executes it using Database.query().

Security: The noQuotes() method is not a standard Apex method on the String class. The Apex Developer Guide does not define noQuotes() as a built-in method (Salesforce Apex Developer Guide, String Class). Assuming it’s a custom method, it likely attempts to remove quotes from the string, but this does not prevent SOQL injection. Concatenating user input directly into the query string is inherently unsafe unless properly sanitized.

Example: If name = ' Test ' OR ' 1 ' = ' 1, and assuming noQuotes() does nothing (or removes quotes, which doesn’t help), the query becomes:

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SELECT Id FROM Account WHERE Name LIKE ' %Test ' OR ' 1 ' = ' 1% '

The OR ' 1 ' = ' 1 ' condition evaluates to true for all records, returning all Accounts, which is a successful SOQL injection attack.

Conclusion: Not safe, as it directly concatenates user input without proper sanitization or bind variables, and noQuotes() is not a reliable or standard method for preventing injection.

C.

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String query = ' SELECT Id FROM Account WHERE Name LIKE \ ' % ' + String.escapeSingleQuotes(name) + ' %\ ' ' ;

List < Account > results = Database.query(query);

Approach: Dynamically constructs a SOQL query string by concatenating name into the query after applying String.escapeSingleQuotes(), then executes it using Database.query().

Security: The String.escapeSingleQuotes() method escapes single quotes in the input by adding a backslash (\), preventing the input from breaking out of the string literal in the SOQL query. The Apex Developer Guide states: “String.escapeSingleQuotes() prevents SOQL injection in dynamic queries by escaping single quotes, ensuring the input cannot alter the query structure” (Salesforce Apex Developer Guide, String Class). This ensures that even malicious input cannot manipulate the query logic.

Example: If name = ' Test ' OR ' 1 ' = ' 1, then String.escapeSingleQuotes(name) returns Test\ ' OR \ ' 1\ ' =\ ' 1. The query becomes:

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SELECT Id FROM Account WHERE Name LIKE ' %Test\ ' OR \ ' 1\ ' =\ ' 1% '

This searches for records where Name matches the literal string %Test ' OR ' 1 ' = ' 1%, which is safe and does not allow the OR condition to execute as logic.

Conclusion: Safe from SOQL injection due to the use of String.escapeSingleQuotes() to sanitize the user input in a dynamic query.

D.

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String query = ' SELECT Id FROM Account WHERE Name LIKE \ ' % ' + name + ' %\ ' ' ;

List < Account > results = Database.query(query);

Approach: Dynamically constructs a SOQL query string by directly concatenating name into the query, then executes it using Database.query().

Security: This approach is vulnerable to SOQL injection because name is directly embedded into the query string without sanitization. The Salesforce Secure Coding Guidelines warn: “Directly concatenating user input into a dynamic SOQL query without escaping can lead to SOQL injection” (Salesforce Secure Coding Guidelines, SOQL Injection).

Example: If name = ' Test ' OR ' 1 ' = ' 1, the query becomes:

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SELECT Id FROM Account WHERE Name LIKE ' %Test ' OR ' 1 ' = ' 1% '

The OR ' 1 ' = ' 1 ' condition evaluates to true for all records, returning all Accounts, demonstrating a successful SOQL injection attack.

Conclusion: Not safe, as it directly concatenates user input without sanitization or bind variables.

Why Options A and C are Correct:

Option A: Uses a bind variable (:query) in the SOQL query, ensuring that the user input (name) is treated as a literal value, not executable code. This is the most secure way to prevent SOQL injection, as recommended by Salesforce.

Option C: Uses String.escapeSingleQuotes() to sanitize the user input before embedding it into a dynamic SOQL query, preventing the input from altering the query’s logic. This is a safe approach for dynamic queries when bind variables cannot be used directly.

Options B and D: Both concatenate user input directly into the query string without adequate sanitization (noQuotes() is not a standard or reliable method in B, and D has no sanitization), making them vulnerable to SOQL injection.

Example of Vulnerability (Option D):

Consider a Visualforce page where name is set via a user input field:

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String name = ApexPages.currentPage().getParameters().get( ' name ' );

String query = ' SELECT Id FROM Account WHERE Name LIKE \ ' % ' + name + ' %\ ' ' ;

List < Account > results = Database.query(query);

If a malicious user submits name = ' OR ' 1 ' = ' 1, the query becomes:

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SELECT Id FROM Account WHERE Name LIKE ' % ' OR ' 1 ' = ' 1% '

This returns all Accounts, bypassing the intended filtering, which is a successful SOQL injection attack.

Mitigating SOQL Injection:

Preferred (Option A): Use bind variables whenever possible:

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String query = ' % ' + name + ' % ' ;

List < Account > results = [SELECT Id FROM Account WHERE Name LIKE :query];

Alternative (Option C): If dynamic SOQL is required, sanitize input with String.escapeSingleQuotes():

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String query = ' SELECT Id FROM Account WHERE Name LIKE \ ' % ' + String.escapeSingleQuotes(name) + ' %\ ' ' ;

List < Account > results = Database.query(query);

Handling Typos:

The options are syntactically correct in the provided image, with no typos to address.

Option B’s name.noQuotes() is not a standard Apex method, but the analysis assumes it’s a custom method that fails to prevent injection, as it’s not a recognized sanitization technique.

Comprehensive and Detailed Explanation From Exact Extract:

Flow Builder is designed for automating business processes declaratively. In this scenario, it can be configured to update the Timezone field on Account whenever the Postal Code is changed by querying the PostalCodeToTimezone__c object and updating the Account accordingly.

Option B: Reusing event logic in the helper ensures cleaner and reusable code.

Option D: Handling low-level events in handlers and re-firing them as higher-level events allows for better abstraction and modularity.

Aura Event Handling Documentation

Option A: The < ltng:require > tag ensures that scripts are loaded only once, even if referenced multiple times.

Option D: The tag allows you to specify the order of scripts to ensure dependencies are loaded correctly.

Option E: Externally hosted scripts can be loaded using thescriptsattribute.

Not Suitable:

Option B (Loading scripts in parallel): Scripts are loaded sequentially to ensure proper dependency handling.

Option C (Loading Files from Documents): Files must be hosted externally or in static resources, not in Documents.

ltng:require Documentation

Why a try/catch block is required:

In Salesforce, DML operations such as insert, update, delete, and upsert can throw exceptions due to issues like validation rule violations, field constraints, or sharing rule restrictions.

Using a try/catch block ensures that these exceptions are caught and handled gracefully, preventing the entire transaction from failing.

How to modify the code:

The update statement in the code can be wrapped in a try/catch block to catch and handle any exceptions that occur. For example:

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public static void insertAccounts(List < Account > theseAccounts) {

try {

for (Account thisAccount : theseAccounts) {

if (thisAccount.website == null) {

thisAccount.website = ' https://www.demo.com ' ;

}

}

update theseAccounts;

} catch (DmlException e) {

System.debug( ' DML Exception: ' + e.getMessage());

}

}

Why not the other options?

A. Implement the upsert DML statement:

upsert is used to either insert or update records based on an external ID or primary key. It does not inherently handle exceptions.

B. Implement Change Data Capture:

Change Data Capture (CDC) is used for tracking changes to data in real time and is unrelated to handling DML exceptions.

D. Remove null items from the list of Accounts:

While cleaning the input data is a good practice, it does not address the need for exception handling during DML operations.

Apex Trigger (Option B):

An Apex trigger can be written on theContainer__cobject to prevent deletion unless theStatus__cfield value is " Decommissioned " .

This allows custom logic to be executed during the deletion process.

Apex Triggers Documentation

Validation Rule (Option D):

A validation rule is typically used to enforce conditions during record creation or update. However, it cannot directly restrict deletions.

To ensure deletion restriction, an Apex trigger is more effective.

Not Suitable:

Option A(Before record-triggered flow): Flows triggered " before delete " are not available.

Option C(After record-triggered flow): These occur after a record is deleted, so they cannot prevent the deletion process.