What is a benefit of using a dynamic VPN?

What is a benefit of using a dynamic 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.

Explanation:
http://tutarticle.com/networking/benefits-of-dynamic-multipoint-vpn-dmvpn/