An uncharged, solid conducting sphere of radius \(R\) contains an off-center spherical cavity of radius \(r_0\). A point charge \(+q\) is fixed inside the cavity at a location that is not at the center of the cavity. The system is in electrostatic equilibrium. Which of the following correctly pairs the potential difference \(\Delta V\) between any two points on the outer surface of the sphere with the symmetry of the electric field \(\vec{E}\) in the region outside the sphere (\(r > R\))?