The correct answer is C. HE (802.11ax).
Explanation:
802.11ax, also known as Wi-Fi 6 or HE (High Efficiency), is the 802.11 physical layer (PHY) specification that supports operation across the 2.4 GHz, 5 GHz, and 6 GHz bands. This specification is designed to improve wireless network efficiency and performance, especially in environments with a high number of devices.
2.4 GHz and 5 GHz bands are already supported by earlier standards like 802.11n (HT) and 802.11ac (VHT), but 802.11ax (HE) extends support to the 6 GHz band as well, which was recently allocated for Wi-Fi use under Wi-Fi 6E.
Answer is C. 802.11ax. 802.11n only suppports 2.4 and 5GHz
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