Which one of the following channels is available in the 802.11­2016 standard that was not available before the ratification of 802.11 ac?

You are implementing a VHT-capable AP.

Which one of the following channels is available in the 802.11­2016 standard that was not available before the ratification of 802.11 ac?
A . 153
B . 161
C . 144
D . 56

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Answer: C