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The function f(x) = 3x 4 − 4x 3 + 12 is defined for all real...

The function f(x) = 3x 4 − 4x 3 + 12 is defined for all real numbers. Where is the function f(x) decreasing?

(a) (1,∞) (b) (−∞, 1) (c) (0, 1) (d) Everywhere (e) Nowhere

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