Simplify $\large\frac{x^{-3}}{2y^3}(\large\frac{1}{xy})^{-3}$

Question

$\begin{array}{1 1} (a)\;\large \frac{1}{2x} \\ (b)\; \large\frac{1}{2} \\ (c)\; \large\frac{2}{x} \\ (d)\; \large\frac{2}{y} \end{array}$