The distance of the point (1, 2, 1) from the line $\frac{x - 1}{2} = \frac{y - 2}{1} = \frac{z - 3}{2}$ is:
$\frac{2\sqrt{3}}{5}$
$\frac{2\sqrt{5}}{3}$
$\frac{\sqrt{5}}{3}$
$\frac{20}{3}$
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