Four point size bodies each of mass M are fixed at four corners of a light squre frame of side length L. The moment of inertia of the four bodies about an axis perpendicular to the plane of frame and passing through its centre is

• A

  4ML²

• B

  $2\sqrt{2}{\mathrm{ML}}^2$

• C

  2ML²

• D

  $\sqrt{2}{\mathrm{ML}}^2$