What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) in IEEE 802.11 WLANs?

Question

Options

• A802.11a and 11n use six (6) "pilot" subcarriers as a reference for the receiver to detect frequency
• B802.11a/g/n OFDM includes several combinations of modulation and coding to achieve data rates
• CWith 802.11a OFDM, 16-QAM provides either 48 or 54 Mbps data rates, depending upon coding
• D802.11ac VHT-OFDM utilizes 256-QAM, which increases the data rate significantly over 64- QAM
• EIn 802.11a OFDM, fifty-six (56) subcarriers are used as parallel symbol transmission paths to

• A
  6% (2)
• B
  6% (2)
• C
  3% (1)
• D
  71% (25)
• E
  14% (5)

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