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b) In a mobile ad-hoc network, dynamic source routing (DSR) is utilised by node A to discover a communication route to node B, answer the following four questions: i) If node A's route request packet of [B,A,1] is received by node C in the same network, what is the format of the packet updated and subsequently broadcast by node C? [2] 3 ii) If the packet updated by node C is also received by node A, how does node A react to the updated packet? [2] iii) To establish a communication path from node B to node A, and if the identified communication path from node A to node B works bi-directionally, describe the approach that node B may use after having received node A's route request packet. [3] iv) If the identified communication path from node A to node B is unidirectional and node B does not hold a valid path to node A, describe the approach that node B may use. [3]