Which IEEE 802.11 wireless standard-marketed as "Wi-Fi 5"-operates solely in the 5 GHz band and can deliver single-link data rates well above 1 Gbit/s, making it significantly faster than 802.11n?
802.11a
802.11ac
802.11n
802.11g
802.11ac, branded as Wi-Fi 5, introduced wider 80 MHz and optional 160 MHz channels, up to eight spatial streams, and 256-QAM modulation. These changes raise its theoretical throughput from around 1.3 Gbps for typical three-stream devices to a maximum of 6.93 Gbps in an eight-stream, 160 MHz configuration. It is limited to the 5 GHz spectrum. 802.11n (Wi-Fi 4) can use either 2.4 GHz or 5 GHz but tops out at 600 Mbps with four spatial streams, while 802.11a and 802.11g reach only 54 Mbps. Therefore, 802.11ac is the only standard that satisfies all parts of the question stem.
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