You have configured voice VLANs on Catalyst switch R1.  Which two statements are true about the  operation of voice VLANs on this device？ （）

A.When the voice VLAN feature is enabled， all untagged traffic is sent according to the default  CoS priority of the port.

B.Enabling voice VLANs enables the switch to create multiple queues for traffic that is entering a  port.

C.When voice VLANs are configured on a trunk link， UplinkFast must also be enabled.

D.Voice VLANs are configured to enable the switch to forward frames marked with the proper  CoS values over separate physical links.

E.Enabling voice VLANs enables the switch to forward frames with a specific 802.1P marking.