Which expression is equivalent to $x y^{\frac{2}{9}}$ ?
A$\sqrt{x y^9}$
B$\sqrt[9]{x y^2}$
C$x\left(\sqrt{y^9}\right)$
D$x\left(\sqrt[9]{y^2}\right)$
A$\sqrt{x y^9}$
B$\sqrt[9]{x y^2}$
C$x\left(\sqrt{y^9}\right)$
D$x\left(\sqrt[9]{y^2}\right)$