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

Answer options:

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

C