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A highly rigid cubical block A of small mass \( M \) and side \( L \) is fixed rigidly onto another cubical block \( B \) of the same dimensions and of low modulus of rigidity \( \eta \) such that the lower face of \( A \) completely covers the upper face of \( B \). The lower face of \( B \) is rigidly held on a horizontal surface. A small force \( F \) is applied perpendicular to one of the side faces of \( A \). After the force is withdrawn, block A executes small oscillations. The time period of which is given by [IIT 1992]
(a) \( 2 \pi \sqrt{\frac{M \eta}{L}} \)
(b) \( 2 \pi \sqrt{\frac{L}{M \eta}} \)
(c) \( 2 \pi \sqrt{\frac{M L}{\eta}} \)
(d) \( 2 \pi \sqrt{\frac{M}{\eta L}} \)
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