Which Identity Source(s) should be selected in Identity Awareness for when there is a requirement...

Endpoint Identity Agent and Browser-Based Authentication are the identity sources that provide the highest level of security for sensitive servers, as they require user authentication and can enforce granular access rules based on user identity. AD Query, Terminal Servers Endpoint Identity Agent, and RADIUS and Account Logon are less secure, as they rely on passive methods of identity acquisition or do not support identity-based access control12.

References: Identity Awareness R81.10 Administration Guide, Identity Awareness AD Query