Four small objects each of mass \( m \) are fixed at the corners of a rectangular wire-frame of ...

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Four small objects each of mass \( m \) are fixed at the corners of a rectangular wire-frame of negligible mass and of sides \( a \) and \( b(ab) \). If the wire frame is now rotated about an axis passing along the side of length \( b \), then the moment of inertia of the system for this axis of rotation is [WB-JEE 2013]
(a) \( 2 m a^{2} \)
(b) \( 4 m a^{2} \)
(c) \( 2 m\left(a^{2}+b^{2}\right) \)
(d) \( 2 m\left(a^{2}-b^{2}\right) \)
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