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

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Answer:   D