Using CCTV from a remote command center to control access and egress for an office...

Remote access control using CCTV requires two-way communication to authenticate identity, provide instructions, and ensure that individuals requesting entry can be properly engaged. This supports access decisions made by personnel monitoring remotely.

A and D (monitoring and visual analysis) are important but secondary to communication.

C (constant camera display) is inefficient and not a requirement if smart alerting or switching is used.