Question: Applying depth - first search algorithm to input directed graph that has loops then: a . If you have a forward edge, then you must

Applying depth-first search algorithm to input directed graph that has loops then:
a. If you have a forward edge, then you must have a cycle
b. If you have a back edge, then you must have a cycle
c. If you have a forward edge, then you may have a cycle
d. If you have a back edge, then you may have a cycle

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