What is the role of a route distinguisher via a VRF-Lite setup implementation?

What is the role of a route distinguisher via a VRF-Lite setup implementation?
A . It extends the IP address to identify which VFP instance it belongs to.
B. It manages the import and export of routes between two or more VRF instances
C. It enables multicast distribution for VRF-Lite setups to enhance EGP routing protocol capabilities
D. It enables multicast distribution for VRF-Lite setups to enhance IGP routing protocol capabilities

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Answer: A