What needs to be addressed in the design?

A customer has multiple WLCs running N+1 redundancy with APs equally distributed. Only one WLC is a designated backup for all other WLCs so the customer must ensure that the most critical APs remain registered or get priority over other APs in case of a WLC failure. However, the customer notices on WLC failure that some critical APs remain unregistered.

What needs to be addressed in the design?
A . AP fallback is not enabled on the backup WL
C . AP failover priority is not enabled globally on the backup WL
E . AP failover priority is not enabled globally on the failed WL
G . AP fallback is not enabled on the failed WL

Answer: C