单选题By default，on the wlan controller for a voice application using cisco 7921 wireless ip phones. what is the percentage of rf bandwidth that can be dedicated to the phones？（）A75 percentB85 percentC56 percentD55 percent
单选题
By default，on the wlan controller for a voice application using cisco 7921 wireless ip phones. what is the percentage of rf bandwidth that can be dedicated to the phones？（）
A
75 percent
B
85 percent
C
56 percent
D
55 percent
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