A point charge Q is placed inside a cavity within a solid isolated conducting sphere. Consider points A , B and C as shown in the figure, where the magnitudes of the electric fields are E A , E B , E C respectively. The points B and C are at the same distance from the center of the solid sphere. The correct option is:

1. A. E A=0,E B=E C
2. B. E A 0,E B=E C
3. C. E A=0,E B>E C
4. D. E A 0,E B<E C

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