A block of mass $10\text{kg}$ is in contact against the inner wall of a hollow cylindrical drum of radius $1\text{m}$. The coefficient of friction between the block and the inner wall of the cylinder is $0.1$. The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be: ($g=10{\text{m/s}}^2$)

1. A
   $10\text{rad/s}$
2. B
   $\sqrt{10}/2\text{rad/s}$
3. C
   $10\text{rad/s}$ (Wait, checking options) -> Correct option logic gives 10.
4. D
   $10\pi \text{rad/s}$