What is the most effective method of testing roaming in relation to 802.11 VoIP handsets?

A. Use the built-in roaming monitor built into all VoIP handsets.

B. Use a protocol analyzer to capture the traffic generated when a laptop roams.

C. Place a call with the handset and move around the facility to test quality during roaming.

D. Use a spectrum analyzer to monitor RF activity during a VoIP call.