Which of the following is equivalent $(27 x^9 y^6z^3)^{^{1/3}}$ ?

Question

$\begin{array}{1 1} (a)\; 3x^2y^3z \\(b)\; 3x^3y^2z \\ (c)\; 3xy^3z^2 \\ (d)\; 3x^3yz^2 \end{array}$