$A$ large drum having radius $R$ is spinning around its axis with angular velocity $\omega$, as shown in the figure. The minimum value of $\omega$ so that a body of mass $M$ remains stuck to the inner wall of the drum, taking the coefficient of friction between the drum surface and mass $M$ as $\mu$, is:

• A
  $\sqrt{\frac{\mu g}{R}}$
• B
  $\sqrt{\frac{2g}{\mu R}}$
• C
  $\sqrt{\frac{g}{2\mu R}}$
• D
  $\sqrt{\frac{g}{\mu R}}$