Which product is a Call Control Server that supports both voice and video communication?

Which product is a Call Control Server that supports both voice and video communication?
A . Cisco Telepresence Management Suite
B . Cisco Content Server
C . Cisco Meeting Server
D . Cisco Unified Communications Manager

Answer: D

Explanation:

Bring people together anytime, anywhere, and on any device with our integrated collaboration infrastructure for voice and video calling, messaging, and mobility.

Cisco Unified Communications Manager (Unified CM) provides reliable, secure, scalable and manageable call control and session management.

https://www.cisco.com/c/en/us/products/unified-communications/call-control/index.html#~stickynav=1