A uniform thin disc has a total mass \(M\) and a radius \(R\). The disc is mounted on a horizontal axle that passes through a point located at a distance \(r\) from the center of the disc, such that \(0 < r < R\). The axle is oriented perpendicular to the plane of the disc. Which of the following expressions correctly represents the rotational inertia \(I\) of the disc about the axle?