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 :

1. A. 1 3 Ml 2
2. B. 4 3 Ml 2
3. C. 2 3 Ml 2
4. D. 13 3 Ml 2

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