What is the element of Cisco collaboration infrastructure that allows Jabber clients outside of the network to register in Cisco Unified communications Manager and use its resources?

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What is the element of Cisco collaboration infrastructure that allows Jabber clients outside of the network to register in Cisco Unified communications Manager and use its resources?
A . Cisco Expressway
B . Cisco prime collaboration provisioning server
C . Cisco Unified Border Element
D . Cisco IM and Presence node

Answer: A