After you deploy Cisco unified communications manager device mobility across a VPN connection with Cisco Unified IP phones, users in remote locations report one-way audio issues. Which two actions can you take to locate the problem?

A.	Verify that DMI is configured with the correct IP subnets.
B.	Verify that the Cisco IOS devices on the VPN support audio connections.
C.	Verify that the VLANs at remote locations are configured correctly.
D.	Verify that users at the remote locations are connecting to the closest enterprise VPN concentrator.
E.	Verify that the firewall is allowing RTP traffic flow.