Simplify : $ \large\frac{\sqrt{x^6(y^3)^{-2}}}{(x^3y)^{-2}}$

Question

$\begin{array}{1 1} (a)\;x^3y \\(b)\; \large\frac{1}{x^3y}\\(c)\; y^3x \\ (d)\; \large\frac{1}{y^3x}\end{array}$