The ratio of torsional moments of resistance of a solid circular shaft of diameter $D$ and a hollow shaft having external diameter $D$ and internal diameter $' d'$ is given by

- 1
  
  $\frac{D^{4}}{D^{4} - d^{4}}$
- 2
  
  $\frac{D^{4} - d^{4}}{D^{4}}$
- 3
  
  $\frac{D^{3}}{D^{3} - d^{3}}$
- 4
  
  $\frac{D^{3} - d^{3}}{D^{3}}$

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