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You are given the region bounded by $y=\sqrt { x } $, $y=4$, and $x=0$.

Find the volume of the solid formed when this region is revolved about the line $x=0$.

$\dfrac { 64 }{ 3 } \pi $

$\dfrac { 1024 }{ 5 } \pi $

$64\pi $

$8\pi $