Which of the following correctly describes NVGRE functionality?

Which of the following correctly describes NVGRE functionality?
A . It allows to create physical leayer-2 topologies on physical layer-3 network.
B . In NVGRE network VSID is used to identity tenant’s address space
C . It allows to create physical leayer-2 topologies on virtual layer-3 network.
D . In NVGRE network VSID does not need to be unique.
E . It tunnels Ethernet frames inside an IP packet over a virtual network
F . In NVGRE network the endpoints are not responsible for the NVGRE encapsulation removal.
G . It tunnels PPP frames inside an IP packet over physical network

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Answer: B