In MPLS VPN, the description of the relationship between VPN, Site, and VPN, which is correct?

In MPLS VPN, the description of the relationship between VPN, Site, and VPN, which is correct?
A . VPN instance and VPN are one-to-one correspondence
B . VPN instance and the site are one-to-one correspondence
C . A site can only belong to one VPN
D . VPN instance and VPN Routing and Forwarding table (VRF) are different concepts.

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Answer: B