Consider a Point Charge and an Imaginary Spherical Surface Surrounding

Consider a point charge and an imaginary spherical surface surrounding it. Which of the following situations would bring about a change in the electrical flux through the surface?

A) Exchanging the spherical surface for a cylindrical surface that still contains the original point charge
B) Bringing a second point charge nearby, but outside the surface
C) Moving the point charge to a point not in the center of the spherical surface
D) Bringing a second point charge nearby, and within the surface

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