How does an MPLS Layer 3 VPN function?

How does an MPLS Layer 3 VPN function?
A . set of sites use multiprotocol BGP at the customer site for aggregation
B . multiple customer sites interconnect through a service provider network using customer edge to provider edge connectivity
C . set of sites interconnect privately over the Internet for security
D . multiple customer sites interconnect through service provider network to create secure tunnels between customer edge devices

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Answer: B