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A charge \( Q \) is distributed over two concentric conducting thin spherical shells radii \( r \) and \( R(Rr) \). If the surface charge densities on the two shells are equal, the electric potential at the common center is
(a) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{(R+r)}{\left(R^{2}+r^{2}\right)} Q \)
(b) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{(R+2 r) Q}{2\left(R^{2}+r^{2}\right)} \)
(c) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{(R+r)}{2\left(R^{2}+r^{2}\right)} Q \)
(d) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{(2 R+r)}{\left(R^{2}+r^{2}\right)} Q \)
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