A, B, and D seem like the obvious choices here. Forwarding customer data packets and maintaining separation between distinct customer networks are definitely key functions of a Layer 3 VPN.
I believe providing an integrated billing solution is not a main function of a Layer 3 VPN. It's more about routing and network separation. So, I would choose A, D, and E as the main functions.
I agree with Scot. Those functions are essential for a Layer 3 VPN to work effectively. Forwarding customer data packets is also important for ensuring data transmission between sites.
I think the main functions of a Layer 3 VPN are distributing customer routing information between sites, maintaining separation between distinct customer networks, and allowing the implementation of Layer 3 devices in the provider core.
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