What must be configured to enable RADIUS authentication with ClearPass on a network access device (NAD)? (Select two.)

What must be configured to enable RADIUS authentication with ClearPass on a network access device (NAD)? (Select 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 up on the NAD
E . a bind username and bind password must be provided

Answer: A,C