What must be done for Cisco WLC and Cisco WCS to communicate?

What must be done for Cisco WLC and Cisco WCS to communicate?

A.
The IP address and subnet mask of the Cisco WLC must be configured in the Cisco WCS.

B.
The IP address and subnet mask of the Cisco WCS must be configured in the Cisco WLC.

C.
The identity certificate of the Cisco WLC must be added to the Cisco WCS.

D.
The Cisco WLC and Cisco WCS must exchange identity certificates.