Which best describes the difference between 802.11n and 802.11ac?

Which best describes the difference between 802.11n and 802.11ac?
A. 802.11ac offers more channels over more bands than 802.11n
B. 802.11ac MCS 1 is about twice as fast as 802.11n MCS1
C. 802.11ac offers more modulation schemes than 802.11n
D. 802.11ac 1SS MCS 9 is allowed over a 20, 40, 80 and 160 MHz channel, while 802.11n 1SS MCS 9 is only allowed over a 20 or 40 MHz channel.

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