What are the main functions of a Layer 3 VPN? (Choose three).

What are the main functions of a Layer 3 VPN? (Choose three).
A . Distributing customer routing information between sites
B. Forwarding customer data packets
C. Providing an integrated billing solution
D. Maintaining separation between distinct customer networks
E. Allowing the implementation of Layer 3 devices in the provider core

Answer: A,B,D