You are configuring an access point to use channel 128. What important fact should be considered about this channels?

You are configuring an access point to use channel 128. What important fact should be considered about this channels?
A . It is a 22 MHz channel so it will overlap with the channels above and below it
B . It is a 2.4 GHz frequency band 40 MHz channel, so it should not be used
C . It is a channel that is unsupported by most access points
D . It is a channel that likely requires DFS when used

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Answer: D