What needs to be enabled on the controller to optimize roaming?

An enterprise is using a Cisco AireOS controller and Wi-Fi 6 APs. The controller is installed in the head office, and the employees primarily use Apple OS devices. The APs broadcast WLAN ENT-WLAN406558520-1 for the employees and a guest WLAN with similar naming.

What needs to be enabled on the controller to optimize roaming?
A . Aggregated Probe Response Optimization
B . Fast SSID Changing
C . Load Balancing Window
D . Client Timers

Answer: B