Please make answer easy to read and separated by each question (a,b,c,d)

Consider the network configuration shown below. Draw figures illustrating encapsulation, addition of headers, trailers, etc. to the original IP datagram at various points in the path for the following scenarios: a) ESP transport mode only from end to end b) AH transport from A to B, ESP tunnel from firewall G1 to firewall G2 c) AH tunnel from A to B, ESP transport from firewall G1 to firewall G3. d) ESP tunnel from G3 to G2, and AH tunnel from G2 to B. G1 G3 G2