Which physical layers are defined by the 802.11 standard?

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Multiple Choice

Which physical layers are defined by the 802.11 standard?

Explanation:
802.11 defines several physical-layer options, but the original specification specifies three: FHSS (frequency-hopping spread spectrum), DSSS (direct-sequence spread spectrum), and infrared. OFDM is not part of the original PHYs; it was introduced later in amendments such as 802.11a (and 11g). So the combination that matches what the standard originally defines is FHSS, DSSS, and Infrared.

802.11 defines several physical-layer options, but the original specification specifies three: FHSS (frequency-hopping spread spectrum), DSSS (direct-sequence spread spectrum), and infrared. OFDM is not part of the original PHYs; it was introduced later in amendments such as 802.11a (and 11g). So the combination that matches what the standard originally defines is FHSS, DSSS, and Infrared.

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