Let A = {a, b, c, d} and f = { (a, 0), (c, 12), (d, 18), (b, 12) }. Is f a function from A to B ? Yes, because each element in the range is paired with a unique element in the domain. O No, because 12 is paired with two domain values. O Yes, because each element in the domain is paired with a unique element in the range. O No, because it doesn't pass the vertical line test.

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