Which of the following best identifies f as a constant function, where x and y are real numbers.
(a) ∃ x ∋ ∀ y, f(x) = y.
(b) ∀ x ∃ y ∋ f(x) = Y.
(c) ∃ y ∋ ∀ x, f(x) = y.
(d) ∀ y ∃ x ∋ f(x) = y.
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