Several communities wish to establish a commuter rail system between cities labeled on the map to the right a Use Kruskal s algorithm to determine the minimum cost spanning tree that would link the cities using the shortest distance b If it costs 6900 per mile of railroad track how much does the commuter rail system determined in part a cost a Choose the correct minimum cost spanning tree below A 24 B 24 B 29 31 44 59 E 61 F 24 73 F b The commuter rail system costs 80 OB O D 24 B B 31 E 31 E 61 44 59 24 B 29 31 73 63 E HA 59 61 55 73 F 63 24