Refer to the exhibit.
A network engineer is attempting to register a Cisco TelePresence endpoint to a Cisco VCS. What is the most likely cause of this failure?
A. The lab.local SIP domain is not configured in the Cisco VCS allow list for registration.
B. The Cisco VCS failed to bind to the LDAP server, which is where the lab.local SIP domain is learned.
C. The lab.local SIP domain does not exist on the Cisco VCS.
D. The endpoint does not have the proper port assignments configured for SIP signaling.
E. The endpoint uses the TCP protocol and the Cisco VCS is configured to allow only TLS for SIP registrations.
