What happens if the identity of a user is known?

What happens if the identity of a user is known?

A.
If the user credentials do not match an Access Role, the gateway moves onto the next rule.

B.
If the user credentials do not match an Access Role, the system displays the Captive Portal.

C.
If the user credentials do not match an Access Role, the traffic is automatically dropped.

D.
If the user credentials do not match an Access Role, the system displays a sandbox.

Explanation: