which configuration is required on the Layer 3 VPN PE router to classify EF packets from the core MPLS network into the expedited-forwarding queue?

Referring to the exhibit, which configuration is required on the Layer 3 VPN PE router to
classify EF packets from the core MPLS network into the expedited-forwarding queue?

A.
Set class-of-service interfaces xe-1/3/0 unit 0 classifiers dscp default

B.
Set class-of-service interfaces xe-1/3/0 unit 0 classifiers dscp DIFFSERVCLASS

C.
Set class-of-service interfaces xe-1/3/0 unit 0 classifiers exp default

D.
Set class-of-service routing-instances CUST classifiers exp DIFFSERVCLASS-EXP

Explanation: