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What is the following fraction simplified?

$$ \frac{\frac{2^3}{6^2}}{3} $$

$ \cfrac{2}{3} $

$ \cfrac{2}{9} $

$ \cfrac{2}{27} $

$ \cfrac{2^{\frac{1}{2}}}{6^{\frac{2}{3}}} $

$ 6^{\frac{1}{3}} $