Which Statement Is Correct

Multiple Choice

Which statement is correct?

A) The flux through a closed surface is always positive.
B) The flux through a closed surface is always negative.
C) The sign of the flux through a closed surface depends on an arbitrary choice of sign for the surface vector.
D) Inward flux through a closed surface is negative and outward flux is positive.
E) Inward flux through a closed surface is positive and outward flux is negative.