单选题Which of the following wireless networking standards can operate at two different frequenciessimultaneously?（）A 802.11aB 802.11bC 802.11gD 802.11n
题目
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