Which statement best describes GRE protocol?

Which statement best describes GRE protocol?
A . GRE adds the new IP header, encapsulates the original IP packet, and adds the GRE header at the end of the IP packet.
B . GRE adds the new IP header, inserts the GRE header, and encapsulates the original IP packet.
C . GRE uses the original IP header and adds the GRE header at the end of the packet.
D . GRE uses the original IP header and inserts the GRE header between the IP header and payload.

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Answer: B