A customer wants to enable existing remote Cisco Jabber users to register their devices to Cisco Unified Communications Manager without using a VPN connection. What should the customer implement in order to achieve this goal?
A. Cisco Expressway Series with MRA
B. Cisco Unified Communications Manager IM and Presence XMPP Federation
C. Cisco VCS with RMA
D. Cisco Expressway Series with Jabber Guest
E. Cisco VCS with Jabber Guest
