Three concentric spherical shells have radii a, b, and c (a < b < c) and have surface charge densities , - and respectively. If V A , V B and V C denote the potentials of the three shells, then, for c=a+b , we have :

1. A. V C=V B=V A
2. B. V C=V A V B
3. C. V C=V B V A
4. D. V C V B V A

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