Let f be the function defined by ƒ (x) = 3x³ 36x + 6 for -4 < x < 4. Which of the following statements is true? A f is decreasing on the interval (0, 4) because f' (x) < 0 on the interval (0, 4). (B f is increasing on the interval (0, 4) because f' (x) < 0 on the interval (0, 4). f is decreasing on the interval (-2, 0) because f" (x) < 0 on the interval (-2,0). f is decreasing on the interval (-2, 2) because f' (x) < 0 on the interval (-2, 2).

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