Let g be a function from Z+ (the set of positive integers) to Q (the set of rational numbers) defined by (x, y) = giff y = 4x - 3/7 (g ≤ Z+ x Q) and let f be a function on Z+ defined by (x, y) = f iff y = 5x² + 2x − 3 (f ≤ Z+ x Z+). Which one of the following is an ordered pair belonging to f? a. (-1,0) b. (2, 21) c. (1,5) d. (3, 44)

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