A solid metal sphere has net charge +Q. How is the charge distributed around the sphere, and why?

a. It is evenly distributed throughout the sphere such that the potential at any point in the sphere is constant.

b. It is evenly distributed on the surface of the sphere such that the potential at any point in the sphere is zero.

c. It is evenly distributed throughout the sphere such that the potential at any point in the sphere is zero.

d. It is evenly distributed on the surface of the sphere such that the potential at any point in the sphere is constant.