(Mobility) There are two ways of handling node mobility in general, indirect routing and direct routing. Consider the following topology. Network A, B, C, D, E, and Fequally divide the circle of radius R. The mobile node lives in network A. Sitting at the center is the network where the correspondent resides. Let's assume the inquiries and replies exchanged between the correspondent and the mobile node are so small that the transmission and the processing delay are negligible. Let's assume also the propagation delay of sending messages within a network is so small that it is also negligible. The delay for the correspondent to send an inquiry and get a reply back from the mobile node is therefore 2R. R 600) Correspondent E (a) Suppose now the mobile node moves to network B. What will be the delay for the correspondent to get a reply back from the mobile node using indirect routing? And what will be the delay using direct routing? (2%) (b) Suppose now the mobile node moves to network B and stays in B for a duration in which the correspondent inquires the mobile node 5 times. How much delay in total the 5 correspondences will take using indirect routing? And how much delay in total using direct routing? (4%) (c) Compare the delay in (a) and (b). Would you prefer to use indirect routing or direct routing if the mobile node will stay in a foreign network for a long while (more than 3 correspondences)? And why? (4%) (d) Suppose now the mobile node moves to network B and stays in B for one correspondence and moves next to C. Similarly, the mobile node stays in C, D, E, F for one correspondence and then moves on to D, E, F, A. Suppose also that messages always travel the shortest delay path. How much delay in total the 5 correspondences (1 in B, 1 in C, 1 in D, 1 in E, and 1 in F) will take using indirect routing? And how much for direct routing (without the anchor foreign agent redirect routing)? (4%) (e) Compare the delay in (a) and (d). Would you prefer to use indirect routing or direct routing if the mobile node continues to move from a foreign network to another with short stays (only 1 correspondence)? And why? (4%)