The moment of inertia of a thin rectangular plate $ABCD$ of uniform thickness about an axis passing through the centre $O$ and perpendicular to the plane of the plate is

A wheel comprises a ring of radius $R$ and mass $M$ and three spokes of mass $m$ each. The moment of inertia of the wheel about its axis is

For the uniform $T$ shaped structure, with mass $3 \mathrm{M}$ moment of inertia about an axis normal to the plane and passing through $O$ would be

A square lamina is as shown in figure. The moment of inertia of the frame about the three axes shown in figure are $I_1, I_2$ and $I_3$ respectively. Select the correct alternative.