Given: ABC University has an Information Technology (IT) building where the Active Directory server is located. They are installing a small WLAN controller and a small RADIUS server in each of 20 campus buildings. WLAN encryption keys are generated by the RADIUS servers. Each RADIUS server will proxy user authentication to the Active Directory server in the IT building.

What AAA model is described?

A.
Single site deployment

B.
Distributed autonomous sites

C.
Distributed sites, centralized authentication and security

D.
Distributed sites and security, centralized authentication