What term correctly completes the following sentence?
802.11a/b/g used a mandatory 800ns guard interval. 802.11n introduces an optional short 400ns
guard interval. Guard intervals (GI) are necessary in OFDM to reduce the likelihood of interference
between two consecutive ____________.

A.
Frames

B.
Packets

C.
Segments

D.
Bits

E.
Bytes

F.
Symbols