In contrast to earlier Wi-Fi speeds, which of the following BEST describes the antenna and
channelization properties used in 802.11n?

A.
MIMO, DSSS

B.
MIMO, OFDM

C.
CSMA, DSSS

D.
CSMA, CDMA

Explanation:
802.11n builds upon previous 802.11 standards by adding multiple-input multipleoutput (MIMO). The additional transmitter and receiver antennas allow for increased data
throughput through spatial multiplexing and increased range by exploiting the spatial diversity
through coding schemes like Alamouti coding. The speed is 150 Mbit/s (even 250 Mbit/s in PHY
level)