3. Give an example of a weighted graph for which the minimum spanning tree is unique. Indicate what the minimum spanning tree is for that graph. Give another example of a weighted graph that has more than one minimum spanning tree. Show two different minimum spanning trees for that graph. What determines whether a graph has more than one minimum spanning tree? Given the following adjacency lists (with edge weights in parentheses) for a directed graph: 4. A: B(5), C(3), DI) D: A(6), C(3) E: F(5) F: D(3), A(4) Execute Dijkstra's shortest-path algorithm by hand on this graph, showing how the data structures evolve, with A as the starting vertex. Clearly indicate which edges become part of the shortest path and in which order