Four identical thin rods each of mass M and length l, from a square frame. Moment of inertia of this frame about an axis through the centre of the square and perpendicular to its plane is :

Question

( A ) $\frac{4}{3}Ml^2$
( B ) $\frac{1}{3}Ml^2$
( C ) $\frac{2}{3}Ml^2$
( D ) $\frac{13}{3}Ml^2$