A community bank has three campus locations and one HQ with the data center operations. Each campus location has four Cisco Catalyst 9120 APs. The data center has a Catalyst 9800 WLC with eight Catalyst 9120 APs. Poor WAN uplinks cause impacted branch AP and wireless client connectivity back to HQ, and each campus location is now planned to have its own EWC controller based on C9120 AP to keep traffic local. This new design must accommodate these requirements:- Guest WLAN will be routed locally.- Employee WLAN must be authenticated 802.1x PEAP via HQ data centerISE but can pass traffic locally once authenticated.- HQ WLC will be the primary backup WLC for each WLC.Which design approach should the consulting engineer take?
A. wo C9120 campus APs must be converted to EWC mode, one for the active controller and the other for standby with HQ WLC set as N+1 backup
B. wo C9120 campus APs must be converted to EWC mode, one for the active controller and the other for standby set as N+1 backup
C. ne C9120 AP in each campus must be converted to EWC mode, and the preferred controller is set to that AP with HQ WLC set as N+1 backup
D. ne C9120 campus AP must be converted to EWC mode, and the preferred controller is set to that AP with HQ WLC should be paired as mobility peer and configured as N+1 backup