A uniform rod of length L and mass M has a point mass M attached at its end and can rotate around a frictionless axle at the other end. The rod is released form rest at an initial angle of 90°, as:
A) the point mass will fall straight downward.
B) the system will oscillate about its center of mass.
C) the point mass will move in a circular arc.
D) the rod will remain at rest.