What is RADIUS CoA (RFC 3576) used for?
A. To force the client to re-authenticate upon roaming to a new Controller.
B. To authenticate users or devices before granting them access to a network.
C. To validate a host address against a whitelist or a blacklist.
D. To transmit messages to the NAD/NAS to modify a user’s session status.
E. To apply firewall policies based on authentication credentials.