Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS?

Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS?
A . VHT (802.11ac)
B . OFDM (802.11a)
C . DSSS (802.11-Prime)
D . HT (802.11n)

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Answer: D