A uniform disc of mass $M$ and radius $R$ is suspended in vertical plane from a point on its periphery. Its time period of oscillation is ........
  • A$2 \pi \sqrt{\frac{3 R}{g}}$
  • B$2 \pi \sqrt{\frac{R}{3 g}}$
  • C$2 \pi \sqrt{\frac{2 R}{3 g}}$
  • D$2 \pi \sqrt{\frac{3 R}{2 g}}$
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