Find f'(x) and simplify. f(x) = 6x³ (x²-9) Which of the following shows the correct application of the product rule? A. (2x) (18x²) B. (6x³) (2x)+ (x²-9) (18x²) C. (6x³) (18x²) + (x²-9) (2x) D. (6x³) (2x) - (x² - 9) (18x²) f'(x) =
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