A disc of mass `m` and radius `R` has a concentric hole of radius `r`. Its moment of inertia about an axis through its center and perpendicular to its plane is

Options

A. `(1)/(2)m(R-r)^(2)`
B. `(1)/(2)m(R^(2)-r^(2))`
C. `(1)/(2)m(R+r)^(2)`
D. `(1)/(2)m(R^(2)+r^(2))`

Answer

d