Which of the following wireless technologies only uses the 5GHz spectrum but reaches a
theoretical throughput of only 54Mbps?

A.
A

B.
B

C.
G

D.
N

Explanation:
802.11a standard uses the same core protocol as the original standard, operates in 5 GHz band,
and uses a 52-subcarrier orthogonal frequency-division multiplexing (OFDM) with a maximum raw
data rate of 54 Mbit/s, which yields realistic net achievable throughput in the mid-20 Mbit/s. The
data rate is reduced to 48, 36, 24, 18, 12, 9 then 6 Mbit/s if required.