Two solid conducting spheres, \(A\) and \(B\), with radii \(R\) and \(2R\) respectively, are separated by a distance much larger than \(2R\) and connected by a thin conducting wire. The system is in electrostatic equilibrium with a net positive charge. Which of the following correctly compares the electric potentials \(V_A\) and \(V_B\) at the surfaces of the spheres and gives the ratio of their surface charge densities \(\dfrac{\sigma_A}{\sigma_B}\)?