Find and simplify the derivative $of$ the following function.

$f(x)=2x^4(5x^2-1)$

Which $of$ the following shows how $to$ find the derivative $off(x)?$

$A.f^{\text{'}}(x)=(\frac{d}{dx}(2x^4))(2x^4)+(5x^2-1)(\frac{d}{dx}(5x^2-1))$

$B.f^{\text{'}}(x)=\frac{(5x^2-1)(\frac{d}{dx}(2x^4))-(2x^4)(\frac{d}{dx}(5x^2-1))}{(5x^2-1{)}^2}$

$C.f^{\text{'}}(x)=\frac{(2x^4)(\frac{d}{dx}(5x^2-1))-(5x^2-1)(\frac{d}{dx}(2x^4))}{(2x^4{)}^2}$

$D.f^{\text{'}}(x)=(\frac{d}{dx}(2x^4))(5x^2-1)+(2x^4)(\frac{d}{dx}(5x^2-1))$

The derivative $off(x)=2x^4(5x^2-1)is.$