A computer network engineer was given a contract to by an accounting firm to provide a network service to five new departments of the company. The network diagram below depicts computer linkages among the five departments. The cables miles are shown on each arc. a) Determine the minimal spanning tree of the cable network and analyse the most economical length of the cable network AP (8 marks) Fig 1. b) Consider the Network in fig. 2 below Fig.2 i. Determine a tree and a spanning tree from the network ii. Determine the sets Nodes (N) and Arcs(A) of the network AP(7 marks) c). Draw the network defined by N = {1, 2, 3, 4, 5, 6} A = {(1,2), (1,5), (2,3), (2,4), (3,4), (3,5), (4,3), (4,6), (5,2), (5,6)}