What statement about route distinguishers in an MPLS network is true?

What statement about route distinguishers in an MPLS network is true?
A . Route distinguishers make a unique VPNv4 address across the MPLS network.
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 define which prefixes are imported and exported on the edge router

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Answer: A