If the product of the zeroes of the polynomial $f(x)=ax^3-6x^2+11x-6$ is $4$ then $a=$

Question

$\begin{array}{1 1}(A) \;\large\frac{3}{2}\\(B)\;-\large\frac{3}{2}\\(C)\;\large\frac{2}{3}\\(D)\;-\large\frac{2}{3}\end{array} $