Which standard is not usable on the 2.4 GHz band according to the material?

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Multiple Choice

Which standard is not usable on the 2.4 GHz band according to the material?

Explanation:
802.11ac is designed for the 5 GHz spectrum, not for the 2.4 GHz band. It uses wider channels and modulation schemes that are defined for 5 GHz operation, and regulatory rules for 2.4 GHz don’t accommodate those features. Because of that, 802.11ac cannot operate on 2.4 GHz, making it unusable there. In contrast, older standards like 802.11b operate in 2.4 GHz, the original 802.11 family covers 2.4 GHz as well, and WPA3 is a security protocol rather than a radio standard and isn’t restricted to a single band.

802.11ac is designed for the 5 GHz spectrum, not for the 2.4 GHz band. It uses wider channels and modulation schemes that are defined for 5 GHz operation, and regulatory rules for 2.4 GHz don’t accommodate those features. Because of that, 802.11ac cannot operate on 2.4 GHz, making it unusable there. In contrast, older standards like 802.11b operate in 2.4 GHz, the original 802.11 family covers 2.4 GHz as well, and WPA3 is a security protocol rather than a radio standard and isn’t restricted to a single band.

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