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Which feature is commonly available to end users via the web interface?
The correct answer is A. Viewing and releasing emails from the quarantine. In Proofpoint's end-user experience, the End User Web Interface is designed primarily to let users interact with quarantined mail and manage a limited set of personal message-handling preferences. Proofpoint customer-facing material notes that users can manage quarantine settings and related sender preferences themselves, which aligns directly with the ability to view and release quarantined messages.
This fits the Threat Protection Administrator course because the End User Web Interface is not intended to function as a full administrative console. End users are not expected to build inbox-routing logic there, customize corporate branding assets, or administer platform-wide presentation elements. Those are administrative or separate product capabilities rather than a standard end-user quarantine task. The course's Quarantine and End User Web sections emphasize that users can review messages held by policy, determine whether a message appears legitimate, and request or perform a release depending on how the environment is configured. That is why quarantine visibility and release are the most common web-interface functions associated with end users.
Although encrypted-message reading may exist in other Proofpoint experiences or adjacent products, that is not the core answer this question is testing. The tested and course-aligned capability for the end-user web interface is viewing and releasing emails from quarantine, making A the correct answer.