Which two functionalities does Cisco Expressway provide in the Cisco collaboration architecture? (Choose two.)

Which two functionalities does Cisco Expressway provide in the Cisco collaboration architecture? (Choose two.)
A . Survivable Remote site Telephony functionality
B . Secure firewall and NAT traversal for mobile or remote Cisco Jabber and TelePresence video endpoints
C . Customer interaction management services
D . Secure business-to-business communications
E . MGCP gateway registration

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Answer: BD