An insect of negligible mass is sitting on a block of mass \( M \), tied with a spring of force ...

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An insect of negligible mass is sitting on a block of mass \( M \), tied with a spring of force constant \( k \). The block performs simple harmonic motion with amplitude \( A \) in front of a plane mirror placed as shown. The maximum speed of insect relative to its image will be:
(a) \( A \sqrt{\frac{k}{M}} \)
(b) \( A \sqrt{3} \sqrt{\frac{k}{M}} \)
(c) \( 2 A \sqrt{\frac{k}{M}} \)
(d) \( \frac{A}{2} \frac{k}{\sqrt{M}} \)
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