According to the Alibaba Cloud Academy, business record filing is a process of registering your website information with the provincial communication management bureau where your server is located. The approval requirements for business record filing vary depending on provincial communication management bureaus. Some provinces may require additional materials or procedures for business record filing. Therefore, the statement is true.  References:   ACA Cloud Computing Exam Preparation Course - Alibaba Cloud , Module 2: Cloud Computing Security, Lesson 2: Business Record Filing, Slide 3.

An ICP license is a permit issued by the Chinese Ministry of Industry and Information Technology (MIIT) that allows websites to operate in China. An ICP license is required for any website that is hosted on a mainland China server, or that wants to use a China-based CDN service to accelerate its access in China. Therefore, you would need to apply an ICP license in the following cases:

Accelerate your Overseas Website in China: If you have a website that is hosted outside of China, but you want to use Alibaba Cloud’s CDN service to improve its performance and user experience in China, you would need to apply an ICP license for your domain name. This is because Alibaba Cloud’s CDN nodes are located in mainland China, and any website that uses them must comply with the Chinese regulations.

Launch your website in China: If you want to host your website on an Alibaba Cloud ECS instance or OSS bucket that is located in mainland China, you would need to apply an ICP license for your domain name. This is because any website that is hosted on a mainland China server must have an ICP license to be accessible and legal in China.

Launch your online shop in China: If you want to run an e-commerce website that sells goods or services to customers in China, you would need to apply an ICP license for your domain name. This is because any website that engages in commercial activities in China must have an ICP license to operate legally and securely in China.

References :  What is an ICP License? - Alibaba Cloud Academy , ICP License Application - Alibaba Cloud Documentation Center

 D is the correct answer because OSS supports 3 internal data copies, no human intervention is required to recover the data when anything goes wrong. OSS provides high data reliability and durability by storing multiple replicas of data on different devices in the same region. OSS automatically detects and repairs data errors or failures, and ensures data consistency across all replicas.  OSS also supports cross-region replication (CRR) to back up data to another region for disaster recovery 1 2

A, B, and C are incorrect answers because they do not reflect the actual backup technology and policies of OSS.

A is incorrect because OSS does not require manual recovery of data, as it automatically handles data errors or failures.

B is incorrect because OSS provides data protection and backup for customers, and customers do not need to safeguard their own data or use offsite backups.

C is incorrect because OSS does not use RAID0+1 configuration of its underlying physical hard disks, but rather uses a distributed storage system that stores multiple replicas of data on different devices.

References :  1 :  OSS Overview   2 :  OSS Backup

SQL injection is a common application layer attack that targets the database of a web application. SQL injection exploits a security vulnerability in the application’s software, such as incorrect filtering of user input, that allows an attacker to send malicious SQL statements to the database.  These statements can then be executed to steal, modify, or delete data, or even execute commands on the server 1 .  SQL injection can also bypass authentication and authorization mechanisms, and sometimes even impersonate or damage the underlying system 2 .  SQL injection is one of the most common and dangerous web attacks, and it can cause serious damage to the confidentiality, integrity, and availability of web applications 3 .  References :  1 :  SQL Injection - OWASP 2 :  SQL Injection - Web Application Firewall - Alibaba Cloud Documentation Center 3 :  Web Application Firewall:What is WAF? - Alibaba Cloud .

 RDS allows users to create multiple databases in one RDS instance, as long as the total storage capacity and performance of the instance are not exceeded. This can help users save costs and simplify management. Users can create, delete, and manage databases in the RDS console or by using SQL commands. However, databases with the same name are not allowed in the same instance, and resources are shared among the databases in the same RDS instance, such as CPU, memory, disk, and network bandwidth.  References :  Operate and Manage a Relational Database on the Cloud ,  Alibaba RDS Course | Cloud Academy ,  ACA Cloud Computing Certification - Alibaba Cloud Academy

 A is the correct answer because Auto Scaling supports adding existing ECS instances into the scaling group, whose status however must be running. Running means that the ECS instance is in a normal state and can provide services. Auto Scaling does not support adding ECS instances that are in other states, such as created, stopped, or preparing. Created means that the ECS instance has been created but has not been started yet. Stopped means that the ECS instance has been stopped and cannot provide services.  Preparing means that the ECS instance is being initialized and cannot provide services 1 2

B, C, and D are incorrect answers because they are not valid states for adding existing ECS instances into the scaling group.

References :  1 :  Add existing ECS instances to a scaling group   2 :  ECS instance lifecycle

OSS object types are the storage classes that define the performance and cost of storing objects in OSS.  OSS supports four object types: Standard, Infrequent Access (IA), Archive, and Cold Archive 1 .  Each object type has different characteristics and scenarios, such as availability, durability, minimum storage duration, and storage overhead 2 .

Object lifecycle management is a feature that allows you to manage objects efficiently and minimize costs throughout the lifecycle of the objects in your bucket. Lifecycle settings create a set of rules that help define the actions that an OSS bucket must perform on a group of objects.  For example, you can configure lifecycle rules to automatically delete expired objects, or convert the storage class of objects to a lower-cost object type 3 .

You can configure lifecycle rules based on the object type of the objects in your bucket. You can specify the object type as a parameter for the lifecycle rule, and OSS will apply the rule to the objects that match the object type.  For example, you can create a lifecycle rule to convert the object type of objects from Standard to IA after 30 days, and then to Archive after 180 days 4 .

Therefore, the correct answer is A. Infrequent access and C. Archive, as these are two of the object types that can be configured as parameters for object lifecycle management. B. Snapshot and D.  Chunk are not valid object types in OSS.  References :  1 :  Overview of object types - Object Storage Service - Alibaba Cloud Documentation Center 2 :  Object Storage Service (OSS) - Alibaba Cloud 3 :  Manage Your OSS Storage Costs Using Lifecycle Policies - Alibaba Cloud 4 :  Lifecycle rules based on the last modified time - Object Storage Service - Alibaba Cloud Documentation Center .

 Alibaba Cloud CDN can directly accelerate the access to the files stored in OSS and reduce OSS traffic costs. Alibaba Cloud CDN is a global network of points of presence (POPs) that are distributed across the globe. Alibaba Cloud CDN serves to reduce back-to-origin traffic. This in turn prevents network congestion and reduces latency.  If you use Alibaba Cloud CDN to accelerate access to OSS, you can benefit from the following advantages 1 :

Improved user experience : Alibaba Cloud CDN caches the files stored in OSS to the POPs that are nearest to the users. This reduces the distance that the files need to travel and improves the access speed and user experience.

Reduced OSS traffic costs : Alibaba Cloud CDN reduces the number of requests that are sent to OSS. This reduces the OSS traffic costs and the load on the OSS servers.

Enhanced security : Alibaba Cloud CDN supports HTTPS secure acceleration and anti-leech protection. This ensures the security and integrity of the files stored in OSS.  References:   Use Alibaba Cloud CDN to accelerate access to OSS

 Server Load Balancer (SLB) can help protect from distributed denial-of-service (DDoS) attacks by distributing network traffic across groups of backend servers to improve the service capability and application availability. SLB also supports built-in Anti-DDoS services to ensure business security.  Anti-DDoS services can mitigate DDoS attacks at the Tbit/s level and provide multiple defense methods, such as blackhole filtering, traffic scrubbing, and access control 1 .  In addition, you can integrate Application Load Balancer (ALB) with Web Application Firewall (WAF) in the console to ensure security at the application layer and prevent attacks such as SQL injection 2 .  References :  1 :  Server Load Balancer(SLB) - Alibaba Cloud 2 :  Associate an EIP protected by Anti-DDoS Pro/Premium with an ALB instance - Server Load Balancer - Alibaba Cloud Documentation Center .

Alibaba Cloud Auto Scaling service allows you to automatically adjust the number of ECS instances in a scaling group based on your business needs and scaling policies.  You can set the minimum and maximum number of instances in a scaling group to limit the range of scaling actions 1 .  When you create a scaling rule, you can specify the number of instances to be added or removed, or the expected number of instances after the scaling action 2 .  You can also create a scheduled task to execute a scaling rule at a specified time or periodically 3 .

In this question, the customer sets the minimum number of instances to 6 and the maximum number of instances to 8 in the scaling group. This means that the scaling group will always have at least 6 instances and at most 8 instances. The customer also adds a scaling rule to remove 5 instances, and creates a scheduled task based on this rule. However, this scaling rule will not be executed if it violates the minimum and maximum limits of the scaling group. Therefore, when the scheduled task is activated once, the scaling group will only remove 2 instances, which is the difference between the current number of instances (8) and the minimum number of instances (6).  The remaining number of instances in the scaling group will be 6, which is the correct answer.  References :  1 :  Create a scaling group - Auto Scaling - Alibaba Cloud Documentation Center 2 :  Create a scaling rule - Auto Scaling - Alibaba Cloud Documentation Center 3 :  Create a scheduled task - Auto Scaling - Alibaba Cloud Documentation Center .