An engineer must implement multicast on an AireOS WLC v8.2 that has 200 LWAPs connected. Reliable reception is a main requirement of this implementation. Which wireless configuration must be performed

Increasing the coverage cell by lowering data rates causes multicast to be transmitted at the lowest (now even lower) mandatory rate, which increases airtime and interference - the opposite of reliable reception.

Decreasing the coverage cell is an outcome of disabling lower data rates (option D), not a standalone wireless configuration action; the question asks for the specific configuration step that must be performed.

Disabling higher mandatory data rates forces multicast to transmit at lower rates, which increases airtime consumption, extends transmission duration, and increases collision probability - reducing reliability rather than improving it.

On AireOS WLC, multicast frames are sent at the lowest configured mandatory data rate and, unlike unicast, receive no ACK and cannot be retransmitted. By disabling lower mandatory data rates (such as 1, 2, and 5.5 Mbps), multicast is forced to a higher mandatory rate, reducing airtime per frame and requiring clients to be in better signal range of an AP in a 200-AP deployment, which significantly improves the probability of reliable reception.