14. Which value of x, with −4 ≤ x ≤ 4, corresponds to the global (absolute) maximum of the functions f(x) = x2(3x2 − 4x − 36) + c, where c is some given real number?
(a) 2
(b) −2
(c) 3
(d) 0
(e) None of the above.
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