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A circular disc $D_1$ of mass $M$ and radius $R$ has two identical discs $D_2$ and $D_3$ of the same mass $M$ and radius $R$ attached rigidly at its opposite ends (see figure). The moment of inertia of the system about the axis OO’, passing through the centre of $D_1$, as shown in the figure, will be:
(1) $MR^2$
(2) $3MR^2$
(3) $\frac{4}{5}MR^2$
(4) $\frac{2}{3}MR^2$
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