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A point charge \( Q \) is placed it the centre of a spherical cavity of raclius \( b \) carved instde a solid conducting sphere of radius \( a \). Thin total energy of the system is- \( \left[k=\frac{1}{4 \pi E_{0}}\right] \)
(A) \( \frac{k Q^{2}}{2 a}-\frac{k \cdot Q^{2}}{2 b} \)
(B) \( \frac{k Q^{2}}{2 a}+\frac{k Q^{2}}{2 b} \)
(C) \( \frac{k Q^{2}}{a}+\frac{k Q^{2}}{b} \)
(D) \( \frac{k Q^{2}}{a}-\frac{k Q^{2}}{b} \)
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