What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?
A . OFDM implements BPSK modulation to allow for data rates up to 7 Gbps.
B . OFDM was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well.
C . OFDM modulation is used only in 5 GHz 802.11 transmissions.
D . OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
Answer: B
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