3. Suppose f: N→ N has the rule [n², f(n) = { n<8 n+1 n ≥ 5 Which of the following statements is true? Select one: O A. f is not a function because f(6) is equal to both 36 and 7. O B. f is not a function because f(3) = 9 and f(8) = 9. O C. f is a function. O D. f is not a function because there is no natural number n such that f(n) = 2.

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