Which of the following graphs are equal to this graph: (Section 4.1) Alt text: A graph with 6 vertices labeled a, b, c, d, e, f, and edges between vertices a and b, a and d, b and c, c and d, c and f, d and e, and e and f.

Group of answer choices

G₁ = ({a, b, c, d, e, f}, {{a, b}, {a, d}, {b, c}, {c, e}, {c, f}, {d, e}, {e, f}})

G₂ = ({a, b, c, d, e, f}, {{a, c}, {a, d}, {b, c}, {c, d}, {c, f}, {d, e}, {e, f}})

G₃ = ({a, b, c, d, e, f}, {{a, b}, {a, d}, {b, c}, {c, d}, {c, f}, {d, e}, {e, f}})

G₄ = ({a, b, c, d, e, f}, {{a, b}, {a, c}, {b, c}, {c, d}, {c, e}, {d, e}, {e, f}})