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.
Answer: B