How should the customer configure ClearPass as an authentication server in the controller so that guests are able to authenticate successfully?

A customer with an Aruba Controller wants it to work with ClearPass Guest.

How should the customer configure ClearPass as an authentication server in the controller so that guests are able to authenticate successfully?
A . Add ClearPass as a RADIUS CoA server.
B . Add ClearPass as a RADIUS authentication server.
C . Add ClearPass as a TACACS+ authentication server.
D . Add ClearPass as an HTTPS authentication server.

Answer: B

Explanation: