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
Answer: A