To configure an Azure Storage account to support both security at the (DP-900)

Correct answer: A. enable the hierarchical namespace.
Enabling the hierarchical namespace allows for security at the folder level and supports atomic directory manipulation in Azure Data Lake Storage Gen2.

Enabling the hierarchical namespace in Azure Storage accounts allows you to organize your data in a directory structure, similar to a traditional file system. This feature is particularly important for scenarios where you need to manage data at a more granular level, such as applying security permissions to specific folders or performing operations that involve directories.