What is RADIUS CoA used for?

A.
To authenticate users or devices before granting them access to a network.

B.
To force the client to re-authenticate upon roaming to a new Controller.

C.
To apply firewall policies based on authentication credentials.

D.
To validate a host MAC against a white and a black list.

E.
To transmit messages to the NAD/NAS to modify a user’s session status.