What is a role of route distinguishers in an MPLS network?

What is a role of route distinguishers in an MPLS network?
A . Route distinguishers define which prefixes are imported and exported on the edge router
B . Route distinguishers allow multiple instances of a routing table to coexist within the edge router.
C . Route distinguishers are used for label bindings.
D . Route distinguishers make a unique VPNv4 address across the MPLS network

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Answer: D