20. One of the opposing forces in a simulated army battle wishes to set up a communications system that will connect the eight camps in its command. The following network indicates the distances (in hundreds of yards) between the camps and the different paths over which a communications line can be constructed: 7 1 5 5 5 5 4 3 3 6 4 2 2 6 7 8 6 10 3 10 4 8 12 Using the minimal spanning tree approach, determine the minimum distance communication system that will connect all eight camps.