What are two functions of Cisco Expressway in the Collaboration Edge? (Choose two.)

What are two functions of Cisco Expressway in the Collaboration Edge? (Choose two.)
A . Expressway-C provides encryption for Mobile and Remote Access but not for business-to-business communications.
B . Expressway-E provides a VPN entry point for Cisco IP phones with a Cisco AnyConnect client using authentication based on certificates.
C . Expressway-E provides a perimeter network that separates the enterprise network from the Internet.
D . The Expressway-C and Expressway-E pair can interconnect H.323-to-SIP calls for voice.
E . The Expressway-C and Expressway-E pair can enable connectivity from the corporate network to the PSTN via a T1/E1 trunk.

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Answer: AD