2. Consider the O-E-O network topology shown in the picture with the source at the node A and destination at the node Z. Follow the following two alternative procedures to find two disjoint paths from the source to the destination. a) Find the shortest path from the source to the destination. Pruning this path from the network topology, perform the graph transformation. Find the alternative path from the source to destination in the transformed topology. Provide a sketch of the transformed topology and name the two link-and-node disjoint paths found following this method. b) Using the method of minimization of the sum of the metrics, find the two link-and-node disjoint paths with the minimum summary metrics. c) Compare the two results provided by the two approaches. Comment on the difference in these results and the advantages of either method over the other