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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