Simplify $\large\frac{(8x^6y^{-3})^{1/3}}{(2xy)^3}$

Question

$\begin{array}{1 1} (a)\; \large\frac{4}{xy^4} \\ (b)\;\large\frac{1}{4xy^4} \\ (c)\; \large\frac{4x}{y^4} \\(d)\; \large\frac{1}{4x^4y^2} \end{array}$