单选题Which of the following wireless standards was the FIRST standard to be ratified and is used to support legacy wireless devices?（）A802.11aB802.11gC802.11bD802.11n
单选题
Which of the following wireless standards was the FIRST standard to be ratified and is used to support legacy wireless devices?（）
A
802.11a
B
802.11g
C
802.11b
D
802.11n
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