You Are Deploying IP Phones to a Customer Site

You are deploying IP phones to a customer site. The IP phones will be installed to share a common access port with the user's desktop computer. You are required to provide a mechanism to place user data traffic and voice traffic in different VLANs for class-of-service application. How would you implement this solution?

A) Configure flexible VLAN tagging on the user ports with the data and voice VLANs as members.
B) Apply a multifield classifier on the access ports that assigns voice packets to the assured-forwarding class, based on the IP phone manufacturer's MAC OUI.
C) Configure the IP phones to label voice traffic with the DSCP of code point and apply a BA classifier to the access ports to classify voice traffic.
D) Configure VLAN tagging on the IP phones and use the voice VLAN feature on the access ports to assign tagged frames to the voice VLAN and untagged frames to a data VLAN.