What distinguishes a Deny List from an Allow List security list?

The distinction between a Deny List and an Allow List is centered around the way access is managed for users and systems. A Deny List is specifically aimed at restricting access; it identifies entities or items that are explicitly blocked from gaining entry to a resource or system. In contrast, an Allow List functions by granting access; it designates which entities or items are permitted entry, effectively filtering out everything else by default.

In essence, while the Deny List focuses on marking what is not allowed, the Allow List focuses on what is permitted, making option A the correct choice. This understanding of access control is crucial in cybersecurity and data management, as it helps organizations define clear and effective security policies to protect sensitive information and resources from unauthorized access.