Refer to the exhibit. Client stations are trying to associate to a given SSID and fail to do so for some time before associating successfully. Considering the debug output that was collected, what could be the cause of the issue? 

Answer options:

A. The WLC is connected to two switches and LAG is not configured.
B. The client was roaming and the SSID does not have the same WLAN ID on all company controllers.
C. The client was already associated to another corporate SSID and Fast SSID change is disabled.
D. The WLAN is constantly brought down because of CAPWAP tunnel flapping.
E. An administrator changed the WLAN ID during the time in question.

C