If a client’s authentication is failing and there are no entries in the Clearpass’s Access
Tracker, which of the following is a possible reason for the authentication failure?

A.
The client used a wrong password.

B.
The user is not found in the database.

C.
The shared secret between Network Access Device and Clearpass does not match.

D.
The user account has expired.

E.
The user’s certificate is invalid.