单选题Which spread spectrum technology does the 802.11b standard define for operation?（）AIRBDSSSCFHSSDDSSS and FHSSEIR, FHSS, and DSSS
单选题
Which spread spectrum technology does the 802.11b standard define for operation?（）
A
IR
B
DSSS
C
FHSS
D
DSSS and FHSS
E
IR, FHSS, and DSSS
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