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A charge \( Q \) is distributed over three concentric spherical shells of radii \( a, b, c(abc) \) such that their surface charge densities are equal to one another. The total potential at a point at distance \( r \) from their common center, where \( ra \), would be
(a) \( \frac{Q(a+b+c)}{4 \pi \varepsilon_{0}\left(a^{2}+b^{2}+c^{2}\right)} \)
(b) \( \frac{Q}{4 \pi \varepsilon_{0}(a+b+c)} \)
(c) \( \frac{Q\left(a^{2}+b^{2}+c^{2}\right)}{4 \pi \varepsilon_{0}\left(a^{3}+b^{3}+c^{3}\right)} \)
(d) \( \frac{Q}{12 \pi \varepsilon_{0}} \frac{a b+b c+c a}{a b c} \)
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