Which of the following sets of edges represent subgraphs of the graph that are trees? (Select all that apply.) |{{a, b}, {a, e}, {b, c}, {d, e}, {e, f}} |{{a, b}, {a, e}, {b, c}, {b, f}, {e, f}} {{a, b}, {b,c}, {d, e}, {e, f}} {{a, e}, {b, c}, {b, f}, {d, e}, {e, f}} {{a, b}, {a, e}, {b, c}}

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