Which ARM function is responsible for converting APs with excess capability into Air Monitors?

The correct answer is linked to the function of co-channel interference mitigation in the context of Adaptive Radio Management (ARM). In a wireless network, access points (APs) can sometimes have excess capability beyond just serving clients; for instance, they may have the ability to also monitor the airwaves for security threats or to gather performance metrics.

When co-channel interference occurs, it can degrade the performance of the network. Co-channel interference happens when multiple APs are transmitting on the same channel, which can lead to increased noise and competition for bandwidth. To improve the overall performance of the wireless network, ARM can repurpose these excess-capability APs into Air Monitors. This adjustment helps in better handling the interference by allowing some APs to focus on monitoring the airwaves, thereby freeing up capacity on the other APs that continue to serve clients.

In this scenario, the function of changing APs from serving clients to monitoring the air is directly related to mitigating co-channel interference, making this the reason why this choice is the correct response to the question posed.