A disc of radius r is removed from the disc of radius R then which of the following are true

Center of mass must lie where mass exists

The minimum shift in center of mass cannot be greater than  $\frac{{\text{r}}^{\text{2}}}{\text{R+r}}$

The shift in center of mass is $\frac{{\text{r}}^{\text{2}}}{\text{R+r}}$

The minimum shift in center of mass is zero