Moment of inertia of a square lamina about one of the diagonals is :

Question

$$\begin {array} {1 1} (a)\;\frac{Ml^2}{6} & \quad (b)\;\frac{Ml^2}{12} \\ (c)\;\frac{Ml^2}{3} & \quad  (d)\;\frac{Ml^2}{24} \end {array}$$