单选题By default， on the WLAN controller for a voice application using Cisco 7921 wireless IP phones， what is thepercentage of RF bandwidth that can be dedicated to the phones？（）A55 percentB56 percentC75 percentD85 percent
单选题
By default， on the WLAN controller for a voice application using Cisco 7921 wireless IP phones， what is thepercentage of RF bandwidth that can be dedicated to the phones？（）
A
55 percent
B
56 percent
C
75 percent
D
85 percent
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