Based on web searches, it seems that Magento uses different classes and interfaces to interact with configuration files, such as Data, Reader, and Converter12.

According to the documentation1, Data is a class that provides access to configuration data using a scope. Reader is an interface that reads configuration data from XML files. Converter is an interface that converts XML data into an array representation.

Based on these definitions, I would say that two possible steps that the Architect should make to meet the requirement are:

• C. Create a Data class that implements “\Magento\Framework\Config\Data”
• E. Make a Reader class that implements “\Magento\Framework\Config\Reader\Filesystem”

These steps would allow the custom module to read all the XML configuration files declared in the system, merge them together, and use their values in PHP class.

The Architect should make two steps to meet this requirement: C) Create a Data class that implements “\Magento\Framework\Config\Data”. This class will be responsible for reading and merging the custom xml configuration files and providing access to their values. The Data class should extend \Magento\Framework\Config\Data and use the constructor to inject the Reader class and the cache type. E) Make a Reader class that implements “\Magento\Framework\Config\Reader\Filesystem”. This class will be responsible for loading and validating the custom xml configuration files from different modules. The Reader class should extend \Magento\Framework\Config\Reader\Filesystem and use the constructor to specify the file name, schema file, and validation state of the custom xml configuration files. Option A is incorrect because writing a plugin for \Magento\Framework\Config\Data::get() will not define a new xml configuration file, but rather modify the existing one. Option B is incorrect because appending the custom xml file name in “Magento\Config\Model\Config\Structure\Reader” in di.xml will not define a new xml configuration file, but rather add it to the system configuration structure. Option D is incorrect because injecting a “reader” dependency for “Magento\Framework\Config\Data” in di.xml will not define a new xml configuration file, but rather use an existing one. References:

To resolve the issue of product price changes not updating on the storefront, you need to take the following steps:

• Make sure that no custom or third-party modules modify the changelog and indexing process. Some modules might interfere with the normal functioning of the indexing mechanism and cause data inconsistency or corruption. You can disable any custom or third-party modules that are related to indexing and check if the issue persists.
• Make sure that the version_id for the price indexer in the mview_state table is not higher than the last entry for the same column in the changelog table and re-synchronize. The version_id column in the mview_state table indicates the current state of each indexer. If this value is higher than the last entry in the changelog table, it means that the indexer has skipped some records and needs to be re-synchronized. You can use the bin/magento indexer:reset command to reset the state of the price indexer and then run bin/magento indexer:reindex to reindex it.

When using multiple backend servers behind a load balancer, the session data must be stored in a shared location that is accessible by all servers. Otherwise, the session data will be inconsistent and users may experience issues such as being logged out unexpectedly. Redis is a recommended option for storing session data in a distributed architecture, as it provides fast and reliable access to the data. The session host value in the env.php file must point to the Redis instance that is used for session storage. References: