When using Generic Routing Encapsulation (GRE) tunneling over Internet Protocol version 4 (IPv4), where is the GRE header inserted?

When using Generic Routing Encapsulation (GRE) tunneling over Internet Protocol version 4 (IPv4), where is the GRE header inserted?
A . Into the options field
B . Between the delivery header and payload
C . Between the source and destination addresses
D . Into the destination address

Answer: B

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