Q15B. Consider the graph with the following vertices and edges: V = {a, b, c, d, e, f} E = {{a, b}, {a, e}, {b, c}, {b, f}, {d, e}, {e, f}} d a e b {{a, b}, {a, e}, {b,c}} Which of the following sets of edges represent subgraphs of the graph that are spanning trees? (Select all that apply.) {{a, b}, {a, e}, {b, c}, {b, f}, {e, f}} {{a, b}, {b, c}, {d, e}, {e, f}} {{a, b}, {a, e}, {b, c}, {d, e}, {e, f}} C {{a, e}, {b, c}, {b, f}, {d, e}, {e, f}}

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