Refer to the exhibit. Which command is used to complete this configuration for QoS class-based marking?
A. PE-A(config-pmap-c)#set dscp ef
B. PE-A(config-pmap-c)#priority
C. PE-A(config-pmap-c)#random-detect
D. PE-A(config-pmap-c)#fair-queue
Correct Answer: A