The following of GRE VPN and BGP / MPLS VPN correctly described ____ .

The following of GRE VPN and BGP / MPLS VPN correctly described ____ .
A . Both can separate the address space
B . both point to point tunnel
C . GRE VPN can separate address space, BGP/MPLS VPN cannot separate address space
D . GRE VPN cannot separate address space, BGP/MPLS VPN can separate address space

Answer: D