Question: 6. (2 pts) Given a directed graph and we run DFS on this graph, if from node u we visit a black node u, then

6. (2 pts) Given a directed graph and we run DFS on this graph, if from node u we visit a black node u, then edge (u. v) is a cross-edge. TRUE/FALSE (circle the right answer) 7. (2 pts) Given a directed graph, and if we can produce a topological sort of its vertices, then a DFS on the graph will produce no back edges. TRUE FALSE (circle the right answer) 8. (2 pts) Kruskal's algorithm can be used to solve the MST problem only for connected and undirected graph, and it may find multiple MSTS. TRUE FALSE (circle the right answer)

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