The Electric Potential at the Surface of a Charged Conductor

The electric potential at the surface of a charged conductor

A) is always zero.
B) is always independent of the magnitude of the charge on the surface.
C) may be set equal to zero by adding an appropriate constant to the potential at all points of space.
D) is always such that the potential is zero at all points inside the conductor.
E) is always such that the potential is always zero within a hollow space inside the conductor.