Which action must be taken for the AP to associate with the controller?

A recently acquired Cisco Aironet 1550 series AP is unable to join the WLC. This message is observed on the AP console:

AAA Authentication Failure for UserName:CC93.1981.0035 User Type: WLAN USER

Which action must be taken for the AP to associate with the controller?
A . Add MAC address CC93.1981.0035 to the Security AAA AP policy Authorization List.
B . Authenticate the AP to the WLC from the console using an admin account on the WL
D . Add MAC address CC93.1981.035 to the Security AAA MAC Filtering tab.
E . Import the self-signed certificate of the AP to the Security:Certificate:LSC tab.
F . Import the self-signed certificate of the AP to the Security:Certificate:SSC tab.

Answer: A