Which of the following is NOT an identity source used for Identity Awareness?

UserCheck is primarily a feature that provides users with notifications and prompts when they attempt to access restricted resources based on security policies. While it plays a role in user engagement, it does not serve as an identity source in the context of Identity Awareness.

In contrast, remote access, RADIUS, and Active Directory queries are all mechanisms that can be used to collect user identity information. Remote access protocols often integrate user identity into security policies, RADIUS servers provide centralized authentication and authorization, and AD queries allow for the retrieval of user attributes and group memberships from Active Directory, facilitating user identity recognition in security contexts.

Therefore, focusing on the functionality of user engagement versus identity sourcing helps clarify why UserCheck does not fit the role of an identity source within Identity Awareness deployments.