To modify the width and height of all product images inside a theme, the developer needs to edit the view.xml file inside the etc directory of the theme. The view.xml file contains the configuration for the theme’s images, fonts, and layout. The images.xml file does not exist by default and is not used for configuring images. The theme.xml file is used for specifying the parent theme and other metadata of the theme. References: [view.xml], [theme.xml]

The developer needs to run these two CLI commands to make the extension work properly:

bin/magento module:enable Vendor_Module --clear-static-content This command enables the extension and clears any outdated static files that might interfere with its functionality.

bin/magento setup:upgrade This command updates the database schema and data according to the extension’s requirements. The other two options are incorrect because they are not necessary to make the extension work properly. The composer install command installs all dependencies specified in the composer.json file, but it does not enable or update any extensions. The composer update vendor/module command updates an existing extension to its latest version, but it does not enable or upgrade it.

The default and production modes are the modes where errors are only written to a log file and not displayed on the screen. This is done to prevent exposing sensitive information to users and attackers. The default mode is the mode that Adobe Commerce runs in by default if no other mode is specified. The production mode is the mode that Adobe Commerce runs in when it is deployed to a live site. The developer can use the following command to check the current mode:

bin/magento deploy:mode:show

The other two options are incorrect because they display errors on the screen as well as writing them to a log file. The developer mode is the mode that Adobe Commerce runs in when it is under development or testing. The developer mode enables enhanced debugging and error reporting features. References:  Adobe Commerce Developer Documentation ,  Adobe Inc.

To implement a custom font specifically for emails, the developer needs to do the following steps:

Add the custom font file to the web/fonts directory of the custom theme.

Use the @import font function with the url of the custom font from the theme in the /Vendor/Theme/web/css/source/_extend.less file. This will import the custom font and make it available for use in other LESS files. For example:

@import font(‘custom-font’, ‘@{baseDir}fonts/custom-font.ttf’, ‘truetype’);

Add in the styles to target the elements that require being changed in the /Vendor/Theme/web/css/source/_email.less file. This file is used to define the styles for email templates. The developer can use the .lib-font-face() mixin to apply the custom font to specific selectors. For example:

lib-font-face( @family-name: @custom-font, @font-path: ‘@{baseDir}fonts/custom-font’, @font-weight: normal, @font-style: normal );

h1 { .lib-font-face( @family-name: @custom-font, @font-path: ‘@{baseDir}fonts/custom-font’, @font-weight: normal, @font-style: normal ); }

The /vendor/Theme/web/css/source/_typography.less file is not suitable for implementing a custom font for emails, as it is used for defining global typography styles for web pages. The < head > < /head > tag is not used for adding fonts in email templates, as it is not supported by most email clients. References: [Custom fonts], [Email templates overview]

Option A is the correct way to initialize a JS component via Layout XML in a custom reference block. The x-magento-init tag is used to specify the component name and the options. Option B is incorrect because it uses the data-mage-init attribute, which is only valid for HTML elements. Option C is incorrect because it uses the x-magento-component tag, which is deprecated and should not be used.

https://developer.adobe.com/commerce/frontend-core/

https://experienceleague.adobe.com/docs/certification/program/technical-certifications/ac/ac-expert/ac-e-fedeveloper0623.html?lang=en