Which two things should you verify if the Cisco NAC Guest Server is configured on the network and the client cannot access the guest network?

Which two things should you verify if the Cisco NAC Guest Server is configured on the network and the client cannot access the guest network? (Choose two.)

A.
The controller can ping Cisco NAC Guest Server.

B.
The controllercan mping and eping Cisco NAC Guest Server.

C.
AAA override is enabled on the guest WLAN.

D.
Controllers and Cisco NAC Guest Server are in the same mobility group.