VoWLAN implementation plans for a current mix of existing Cisco Unified Wireless IP Phones 7920G and 7921G to a final migration of Wireless IP Phones 7925G in a single WLAN. What would be the most appropriate WLC WLAN configuration to end with Wireless IP Phones 7925G?

VoWLAN implementation plans for a current mix of existing Cisco Unified Wireless IP Phones 7920G and 7921G to a final migration of Wireless IP Phones 7925G in a single WLAN. What would be the most appropriate WLC WLAN configuration to end with Wireless IP Phones 7925G?
A . 7920 Client CAC = enabled only; Radio Policy = All; WMM = Disabled
B . 7920 AP CAC = enabled only; Radio Policy = All; WMM = Allowed
C . 7920 Client CAC = enabled only; Radio Policy = 802.11a only; WMM = Disabled
D . 7920 AP CAC = enabled only; Radio Policy = 802.11a only; WMM = Allowed
E . 7920 Client CAC = enabled only; Radio Policy = 802.11b/g only; WMM = Disabled
F . 7920 AP CAC = enabled only; Radio Policy = 802.11b/g only; WMM = Allowed

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Answer: B