You have observed that the legacy 802.11a/g clients on your wireless network are often rate shifting to the next lower rate. Which functionality must you turn on to help prevent this rate shift and…

ClientLink is a Cisco technology that uses beamforming to improve signal strength and performance for clients, but it primarily targets 802.11n/ac/ax clients and doesn't specifically address rate shifting caused by general interference as CleanAir does for legacy devices.

BandSelect is a feature that encourages dual-band clients to connect to the 5 GHz band over the 2.4 GHz band, which is not directly related to preventing rate shifting on existing 802.11a/g connections.

CleanAir is a Cisco technology designed to detect, classify, locate, and mitigate sources of RF interference on wireless networks. By actively identifying and avoiding sources of interference, CleanAir helps stabilize client connections and prevent rate shifting, improving performance for legacy clients and overall network efficiency.

VideoStream is a feature designed to optimize video traffic delivery over wireless networks, ensuring QoS for video streams, but it does not directly prevent rate shifting caused by RF interference for general client connectivity.