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Given $x>0$ and $y>0$, select the expression that is equivalent to$\newline$$$\sqrt[4]{256 x^{2} y^{8}}$$$\newline$$64 x^{2} y^{\frac{1}{2}}$$\newline$$4 x^{2} y^{\frac{1}{2}}$$\newline$$64 x^{\frac{1}{2}} y^{2}$$\newline$$4 x^{\frac{1}{2}} y^{2}$