P = 0.0 P = 0.1 P = 0.2 A D P = 0.7 E P = 0.6 Consider a multihop wireless network shown above. The numbers represent the probability of a packet error along each individual link. Answer the following questions. a) Assuming the hop count routing metric, compute the route costs from node A to node D for all possible paths (5 marks) b) Compute the ETX link cost for each wireless link (10 marks) c) Compute the shortest ETX cost from node A to node D for all possible paths (5 marks) d) If a transmission of a single packet costs 5uJ, compute the total transmission cost along each path assuming ETX metric