which alternative Cisco IOS method is available if GRE-over-IPsec tunnels cannot be used?

When implementing point-to-point secure WAN solutions over the Internet, which alternative Cisco IOS method is available if GRE-over-IPsec tunnels cannot be used?

When implementing point-to-point secure WAN solutions over the Internet, which alternative Cisco IOS method is available if GRE-over-IPsec tunnels cannot be used?

A.
Virtual RoutingForwardings (VRFs)

B.
Virtual Tunnel Interfaces (VTIs)

C.
dynamic crypto maps

D.
GET VPN

E.
MPLS VPN

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Jerry Roy

Jerry Roy

give me an example of a scenario where GRE-over-IPsec tunnels cannot be used?

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