Which function is onto (surjective) but not one-to-one (injective)? f: {a, b, c, d} → {1, 2, 3, 4}, f(a) = 1, f(b) = 2, f(c) = 3, f(d) = 4 f: Z* → Z* such that f(x) = x²,Væ € Z* O f:RR such that f(r) = 2x? + 1, Væ eR f:Z Z such that f(x) = 3x, Va e Z None of the above O O O O O

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A: relation on Z.

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