A company already has a Cisco Unified Communications Manager for internal audio and video traffic, but it requires video communication with external partners and customers. It is important to ensure security for the deployment and the connectivity. What must be set up to enable this requirement? 

Answer options:

A. Cisco Unified Border Element and Cisco ASA Firewall
B. Cisco Unified Border Element and Cisco Firepower Firewall
C. Cisco Expressway-C and Cisco Expressway-E
D. Cisco Expressway-C and Cisco Unified Border Element

C