Two thin discs, each of mass \( M \) and radius \( r \) metre, are attached as shown in figure, ...

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Two thin discs, each of mass \( M \) and radius \( r \) metre, are attached as shown in figure, to form a rigid body. The rotational inertia of this body about an axis perpendicular to the plane of \( \operatorname{disc} \) \( B \) passing through its centre is
(1) \( 2 M r^{2} \)
(2) \( 3 M r^{2} \)
(3) \( 4 M r^{2} \)
(4) \( 5 \mathrm{Mr}^{2} \)
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