What is the Cisco recommended setting for the Cisco WLCv5.2 DHCP Required on the WLAN for the Cisco Unified Wireless IP Phone 7921G?

A.
DHCP Required should be enabled because it is required to get a DHCP address.

B.
DHCP Required should be disabled because there are some 802.11 control messages that can impact roaming.

C.
DHCP Required should be enabled if the WLAN supports both the Wireless IP Phone 7921G and Cisco IP Softphone clients.

D.
DHCP Required does not impact the Wireless IP Phone 7921G operation; setting it depends on the customer desire to use static or DHCP addressing for the 7921G.