You are troubleshooting a problem with a cisco 7920 wireless ip phone that is causing the phone to drop calls. the problem appears to be a roaming bandwidth issuE.  in order to verify what kind of issue it is, you decide to increase the bandwidth reserved for roaming on the wlan controller to the maximum.<br /> What level do you set the bandwidth to?()
A、25 percent
B、15 percent
C、5 percent
D、35 percent