Which of the following graphs are trees? *
Extracted text: ?Which of the following graphs are trees a) G=(V,E) with V=(a, b, c, d, e) and E={{a, b}, {a, e), (b, c}, {c, d},{d, e}} b) G=(V,E) with V=(a, b, c, d, e) and E={{a, b}, { {b, c}, {c, d},{d, e}} c) G=(V,E) with V=(a, b, c, d, e) and E={{a, b}, {a, c}, {a, d}, {a, e}} d) G=(V,E) with V3(a, b, c, d, e) and E={{a, b}, {a, c}, {d, e}}