What 802.11 PHY uses available space in very low frequency ranges that is not in use at the time by broadcast video signals?

What 802.11 PHY uses available space in very low frequency ranges that is not in use at the time by broadcast video signals?
A . DMG
B . SIG
C . DSSS
D . TVHT

Answer: C

Explanation:

https://www.cwnp.com/802-11ac-vht-just-the-facts/

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