You are the administrator for Cisco ASA security appliances that are used for site-to-site VPNs between remote and corporate offices. You have used the Service Policy Rule Wizard within ASDM to configure low-latency queuing for unified communications on all the appropriate ASAs. Users are still having issues with unified communications between the remote and corporate offices. Assuming that the Cisco Unified Communications equipment is functioning properly and that the VPN configurations are correct, which of these choices is most likely the cause of the problems?

A.
The DSCP, expedite forward, ef (46), was used to determine unified communications traffic within the Service Policy Rule Wizard.

B.
The tunnel group and DSCP traffic matching criteria were configured within the Service Policy Rule Wizard.

C.
Both a policing and priority queue must be applied on the interface to expedite the voice and control data flows.

D.
A priority queue must be created on the interface where the site-to-site VPN tunnel is terminated.