Which statement describes how RSSI information is processed in a WLAN with a location appliance using controller-based products?

Which statement describes how RSSI information is processed in a WLAN with a location appliance using controller-based products?

A.
Access points aggregate RSSI information.

B.
WLAN controllers compute RSSI information.

C.
The location appliance collects the RSSI information.

D.
The Cisco WCS collects and aggregates the RSSI information and forwards it to the location appliance.