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You are given the region bounded by the lines $f(x)=x$, $x=2$ and $y=0$.

Find the volume of the solid formed when this region is revolved about the $x$-axis.

$\dfrac { 8 }{ 3 }$

$\dfrac { 8\pi }{ 3 }$

$\dfrac { 2\pi }{ 3 } $

$\dfrac { 4\pi }{ 3 } $