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

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