In MPLS Layer 3 VPN implementations, what is used on the PE router to isolate potential overlapping routing information between different customers?

In MPLS Layer 3 VPN implementations, what is used on the PE router to isolate potential overlapping routing information between different customers?
A . route targets
B . VRFs
C . VC IDs
D . pseudowire IDs
E . pseudowire classes

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Answer: B