Which of the following is the correct equation to find the area of th…

$A=2 \int\limits_0^8\left(2 x-x^2\right) d x$

$A=2 \int\limits_0^4\left(2 x-x^2\right) d x$

$A=2 \int\limits_0^4\left(2 x-\frac{x^2}{4}\right) d x$

$A=\int\limits_0^8\left(2 x-\frac{x^2}{4}\right) d x$