Which three Layer 3 VPN technologies are based on the overlay model.? (Choose three.)

Which three Layer 3 VPN technologies are based on the overlay model.? (Choose three.)
A . ATM virtual circuits
B . Frame Relay virtual circuits
C . GRE/IPsec
D . L2TPv3
E . MPLS Layer 3 VPNs
F . DMVPNs

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Answer: C,D,F