What is a benefit of using a group VPN?

What is a benefit of using a group VPN?
A. It provides a layer of redundancy on top of a point-to-point VPN mesh architecture.
B. It eliminates the need for point-to-point VPN tunnels.
C. It provides a way to grant VPN access on a per-user-group basis.
D. It simplifies IPsec access for remote clients.

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