After a wireless deployment, users report that wireless voice clients are experiencing an unacceptable amount of delay while roaming during a call on the Cisco Unified 7925 Series phones. The customer environment consists of multiple controllers, all running 22.214.171.124 code, operating in a centralized deployment. What configuration issue is most likely contributing to the problem?
A . The authentication should be set to WPA2-PSK to allow for 802.11n speeds for the Cisco Unified 7925 phones.
B . The access points on that floor are all on one controller and should be load balanced evenly across multiple controllers.
C . The access points for that floor are salt and peppered across multiple controllers and should be moved to the primary controller.
D . The wireless phones are operating in the 2 4 GHz band and should be configured for the 5 GHz band.