A block of mass \( M \) is kept on a smooth surface and touches the two springs as shown in the ...

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A block of mass \( M \) is kept on a smooth surface and touches the two springs as shown in the figure but not attached to the springs. Initially springs are in their natural length. Now, the block is shifted \( \left(l_{0} / 2\right) \) from the given position in such a way that it compresses a spring and released. The time-period of oscillation of mass will be
\( \mathrm{P} \)
(a) \( \frac{\pi}{2} \sqrt{\frac{M}{k}} \)
(b) \( 2 \pi \sqrt{\frac{M}{5 k}} \)
(c) \( \frac{3 \pi}{2} \sqrt{\frac{M}{k}} \)
(d) \( \pi \sqrt{\frac{M}{2 k}} \)
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