What is the cell constant of a cell of an electrode having dimensions 4cm & 3cm and the two electrodes are separated by 2cm?

Question

$\begin{array}{1 1}(A)\;1/3cm^{-1}&(B)\;1/6cm^{-1}\\(C)\;1/9cm^{-1}&(d)\;1/2cm^{-1}\end{array}$