Which keypad sequence will reset the Cisco Unified Wireless IP Phone 7921 to factory default?（）

A.Disable DTPC on the radio.
B.Disable higher data rates on the radio.
C.Disable WMM policy on the WLAN.
D.Disable multicast on the WLAN.

A.Wireless client WMM UP classification is translated to a wired DSCP priority.
B.Wireless client 802.11p classification is translated to a wired DSCP priority.
C.Wireless client WMM UP classification is translated to a wired 802.1p CoS priority.
D.Wireless client 802.11p classification is translated to a wired 802.1p CoS priority.
E.WLAN configured QoS level is used to set the wired DSCP priority.
F.Wired 802.1p CoS priority is not set.