A wheel of radius \(R\) rolls without slipping along a horizontal surface. The center of mass of the wheel moves at a constant speed \(v_0\) relative to the ground. A point \(P\) is located on the outer rim of the wheel. At time \(t = 0\), point \(P\) is at its lowest position, in contact with the ground.

Which of the following graphs best represents the speed \(v\) of point \(P\) relative to the ground as a function of time \(t\) for one complete revolution of the wheel?