The VCS Expressway can be configured with security controls to safeguard external calls and endpoints. One such option is the control of trusted endpoints via a whitelist. Where is this option enabled?

A.	on the voice-enabled firewall at the edge of the network
B.	on the VCS under Configuration > registration > configuration
C.	on the TMS server under Registrations > whitelist
D.	on the VCS under System > configuration > Registrations