What method may be used by lightweight access points to locate their WLAN controller?

A.
The access points can use the Wi-Fi Controller Resolution Protocol (WCRP) to identify and communicate with a controller.

B.
Controllers contain unique Radio Frequency Identifier (RFID) tags that can be located and tracked by lightweight access points.

C.
Lightweight access points can be programmed with the DNS name of the controller. They receive an IP address and the address of a DNS server from a DHCP server.

D.
Lightweight access points use layer-2 and layer-3 SNMP sweeps to determine the host name or the IP address of the controller.