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
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