What must be configured to enable RADIUS authentication with ClearPass on a network access device (NAD)? (Choose two.)
A. The ClearPass server must have the network device added as a valid NAD.
B. The ClearPass server certificate must be installed on the NAD.
C. A matching shared secret must be configured on both the ClearPass server and NAD.
D. An NTP server needs to be set on the NAD.
E. A bind username and bind password must be provided.
A and C are correct.