To meet the requirements, the Architect should use the following solution: * Create Fixed Bundle Product for gathering simple products. This will allow the purchase of a pre-defined set of products with a discount and separate stock and tax class for each product. * Manage price for every selected option. This will allow setting the original and sales price for each product in the bundle. * Add extension attribute original_simple_price for \Magento\Sales\Api\Data\OrderItemExtensionInterface and populate value with price of simple product. This will allow exposing the original price of the simple product via REST API along with other required dat

a. Option B is incorrect because Dynamic Bundle Product will not allow setting a pre-defined set of products with a discount. Option C is incorrect because Grouped Product will not allow setting a discount for the whole set of products. Reference: https://docs.magento.com/user-guide/catalog/product-create-bundle.html https://devdocs.magento.com/guides/v2.4/extension-dev-guide/extension_attributes/adding-attributes.html

Option B is the correct way to make sure the vcl_hash function of Varnish also considers the newly created attribute. The Architect should create a new module that depends on Magento_Fastly and declare a plugin for \Magento\Fastly\Model\Config::getVclSnippets() method. The plugin should add a new snippet to the result array with the type 'recv' and the content 'set req.http.my_attribute = req.http.X-Magento-Vary;'. This will append the value of the customer attribute to the hash key used by Varnish for caching. Option A is incorrect because it modifies the core file of Magento_Fastly module, which is not recommended and can cause issues during upgrades. Option C is incorrect because it uses the wrong type and content for the snippet, which will not affect the vcl_hash function. Reference: https://devdocs.magento.com/cloud/cdn/fastly-vcl-bypass-to-origin.html

According to the Adobe Commerce Developer Guide2, to make sure the vcl_hash function of Varnish also considers the newly created attribute, the Architect should use a plugin for Magento\Customer\Model\Context::getVaryString method and add the attribute value to the vary string. This will ensure that Varnish caches different versions of GraphQL queries based on the attribute value of the customer. Therefore, option B is correct. Option A is not correct because it does not affect the vcl_hash function. Option C is not correct because it does not use a plugin for the getVaryString method.

By setting the same cookie domain for both websites, the customer base can be shared between both websites, as the customer will be authenticated by the same cookie across both sites. This will ensure that customers don't have to log in twice when switching between the two sites.

Setting Cookie Domain for both websites to ''.example.com'' will allow both websites to use the same customer base. This is because the cookie domain determines which websites can access the customer information stored in the cookie. By using a common domain, both websites can share the same customer cookie.See Multiple websites or stores in the Adobe Commerce Help Center1. Reference: https://experienceleague.adobe.com/docs/commerce-operations/configuration-guide/multi-sites/ms-overview.html?lang=en1

The best way to meet this requirement is to set the CONSUMERWAITFORMAXMESSAGES variable to true in the deployment stage. This variable will ensure that the consumer will not terminate when there are no more messages in the queue and will instead wait until a new message is available, preventing it from closing the connection prematurely. Additionally, the multiple_processes limit can be increased to spawn more processes for each consumer, which will help ensure that messages can be processed faster.

Setting CONSUMER_WAIT_FOR_MAX_MESSAGES variable true in deployment stage will make sure that consumers do not terminate after processing available messages in the queue when CRON job is running these consumers. This will prevent consumers from closing TCP connections too often and improve performance.See Start message queue consumers in the Adobe Commerce Help Center1. Reference: https://experienceleague.adobe.com/docs/commerce-operations/configuration-guide/message-queues/consumers.html?lang=en2https://experienceleague.adobe.com/docs/commerce-operations/configuration-guide/cli/start-message-queues.html1

To display customer-specific content on the home page to Customers with ''my.attribute'' greater than 3, you need to use the following steps:

Use customer-data JS library to retrieve ''my.attribute'' value. The customer-data JS library allows you to access the customer data stored in the local storage of the browser. You can use the get() method to get the value of ''my.attribute'' for the current customer.

Add a new context value of ''my.attribute'' to Magento\Framework\App\Http\Context. The HTTP context is a mechanism that allows you to vary the cache of a page based on some parameters. By adding a new context value of ''my.attribute'', you can cache separate versions of the home page for customers with different values of ''my.attribute''.

Add a custom block and a phtml template with the content to the cms_index_index.xml layout. This step will create a block that will display the customer-specific content on the home page. You can use the phtml template to check the value of ''my.attribute'' and render the content accordingly.

: https://devdocs.magento.com/guides/v2.3/extension-dev-guide/cache/page-caching/public-content.html : https://devdocs.magento.com/guides/v2.3/howdoi/checkout/checkout_customize.html