Mashaal Masha
The expression $\frac{x^{-2}y^{\frac{1}{2}}}{x^{\frac{1}{3}}y^{-1}}$, where $x>1$ and $y>1$, is equivalent to which of the following? 
Difficulty: Hard
A: 

$\frac{\sqrt{y}}{\sqrt[3]{x^{2}}}$

B: 

$\frac{y\sqrt{y}}{\sqrt[3]{x^{2}}}$

C: 

$\frac{y\sqrt{y}}{x\sqrt{x}}$

D: 

$\frac{y\sqrt{y}}{x^{2}\sqrt[3]{x}}$

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