Differentiate. f(x) = 3x(5x + 4)° O A. f'(x) = 3(5x+ 4) (20x + 4) O B. f'(x) = 3(20x + 4) OC. f(x) = 3(5x + 4) O D. f'(x) = 3(5x +4)°(8x + 4)

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