单选题Which of the following wireless networking standards can operate at two different frequenciessimultaneously?（）A802.11aB802.11bC802.11gD802.11n

单选题
Which of the following wireless networking standards can operate at two different frequenciessimultaneously?（）
A

802.11a

B

802.11b

C

802.11g

D

802.11n

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