What $is$ the volume $of$ the solid $of$ revolution generated

$by$

revolving the area bounded $byy=4$ and $y=x^2$ around

the $x-$axis?

Select one:

$a.,\frac{256}{5}$ units ${?}^{(}3)$

$b.\frac{128}{5}$ units ${?}^{(}3)$

$c.\frac{512}{15}$ units ${?}^{(}3)$

$d.0$ units ${?}^{(}3)$