Question: What action can a DN-AAA server take at any time regarding authentication and authorization for a PDU Session?
Option 1: Update the authentication credentials.
Option 2: Revoke the authentication and authorization.
Option 3: Suspend the PDU Session temporarily.
Option 4: Renew the authorization period.
Explanation: According to the security architecture of the 5G System, a DN-AAA server has the capability to revoke the authentication and authorization for a PDU Session at any time. This action is typically taken in response to changes in the user's permissions or as a security measure when suspicious activity is detected.