Which of the following wireless standards is only capable of 5GHz frequencies?
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A. B. C. D.A.
The correct answer is B. 802.11ac.
Wireless standards are a set of protocols that define how wireless devices communicate with each other. These protocols are identified by their IEEE (Institute of Electrical and Electronics Engineers) standard number, such as 802.11a, 802.11b, 802.11g, and 802.11ac.
The 802.11a wireless standard operates only in the 5GHz frequency band and has a maximum data rate of 54 Mbps. However, it is not commonly used in modern networks.
The 802.11b wireless standard operates only in the 2.4GHz frequency band and has a maximum data rate of 11 Mbps. This standard is also not commonly used in modern networks.
The 802.11g wireless standard operates in the 2.4GHz frequency band and has a maximum data rate of 54 Mbps. This standard is still used in some modern networks, but it has largely been replaced by newer standards.
The 802.11ac wireless standard is the newest standard and operates only in the 5GHz frequency band. It has a maximum data rate of up to 6.77 Gbps and supports multiple-input, multiple-output (MIMO) technology, which allows for multiple antennas to be used for both sending and receiving data. This standard is commonly used in modern networks and provides faster speeds and better performance than older standards.
Therefore, the correct answer is B. 802.11ac, as it is the only wireless standard that is only capable of 5GHz frequencies.