Use the product rule to find the derivative.
f(x) = (4x-2)(4x³ - x² + 1)
a. f(x) = 64x³ - 12x² + 36x + 4
b. f(x) = 48x³ + 36x² - 12x + 4
c. f(x) = 64x³ - 36x² + 4x + 4
d. f(x) = 16x³ + 12x² - 36x + 4