Which three statements about Cisco VCS are true'? (Choose three.)

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Which three statements about Cisco VCS are true'? (Choose three.)

A. It is available as a standalone appliance, but not as an application for virtual environments
B. It offers interoperability with third-party unified communications. IP telephony networks, and VoIP and video systems.
C. It simplifies session management and control of Cisco Telepresence conferences
D. It facilitates business-to-business Cisco Telepresence and video communications as long as it is within firewall limits.
E. It works with Cisco Unified Communications and VoIP solutions to provide an optimal user experience, regardless of location or device.
F. It can be deployed as Cisco Telepresence Video Communication Server control for internal and external communication