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 ofissue it is， you decide to increase the bandwidth reserved for roaming on the WLAN controller to themaximum. What level do you set the bandwidth to？（）

A. 5 percent
B. 15 percent
C. 25 percent
D. 35 percent