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

Find the volume of the solid formed when this region is revolved about the line $x=4$.

$\dfrac { 512 }{ 5 } \pi $

$\dfrac { 256 }{ 5 } \pi $

$\dfrac { 512 }{ 15 } \pi$

$\dfrac { 256 }{ 15 } \pi$