While troubleshooting an AToM L2VPN service, a network consultant notices that the AC Layer 2 encapsulations are differe

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While troubleshooting an AToM L2VPN service, a network consultant notices that the AC Layer 2 encapsulations are different. Which action should the consultant take in order to make the MPLS L2VPN work?

A. tag-rewrite on the ingress and egress PE router
B. interworking IP configuration on the last PE router before label disposition
C. nonrouted interworking setup to properly translate only the Layer 2 information from the AC
D. interworking IP configuration on both the AC terminations on the PEs