A flat horizontal board moves up and down under $S.H.M.$ vertically with amplitude $A$. The shortest permissible time period of the vibration such that an object placed on the board may not lose contact with the board is ..........
  • A$2 \pi \sqrt{\frac{g}{A}}$
  • B$2 \pi \sqrt{\frac{A}{g}}$
  • C$2 \pi \sqrt{\frac{2 A}{g}}$
  • D$\frac{\pi}{2} \sqrt{\frac{A}{g}}$
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