28. Given a weighted graph as shown by the figure. Which one of the following statements is TRUE about its minimum spanning tree? A 4 9 F 6 B G 4 7 4 3 5 8 2 H 6 E 5 3 7 D a) If the weight of edge D,E) was 9, then the minimum spanning tree would not be unique. b) The minimum spanning tree is not unique and the total weight is 28. c) If the weight of edge (E,F) was 3, then the minimum spanning tree would not be unique. d) The minimum spanning tree is not unique and the total weight is 26