Which mechanism is used by IP RTP Priority to classify packets?

A.
QoS Group

B.
IP Precedence

C.
Access Control List (ACL)

D.
Differentiated Services Code Point (DSCP)

E.
Dynamically Negotiated UDP ports within a specified range.

Explanation:

IP RTP Prioritization classifies packets based on UDP port numbers. If the destination UDP port is within the configured range it is enqueued into the high priority queue.
Reference: introduction to IP QoS p.3-136