The configuration of a wireless LAN controller as a RADIUS client is ensured by doing what?

A.
adding the MAC address of the physical port of the controller into the trusted client table of
theCiscoSecure RADIUS server

B.
using an encrypted tunnel between theCiscoSecure RADIUS server and the controller

C.
defining a RADIUS server secret at both theCiscoSecure RADIUS server and the controller

D.
implementing an EAP exchange between theCiscoSecure RADIUS server and the controller