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Shown in the figure are two point charges \( +Q \) and \( -Q \) inside the cavity of a spherical shell. The charges are kept near the surface of the cavity on opposite sides of the center of the shell. If \( \sigma_{1} \) is the surface charge on the inner surface and \( Q_{1} \) net charge on it and \( \sigma_{2} \) the surface charge on the outer surface and \( Q_{2} \) net charge on it then
(A) \( \sigma_{1} \neq 0, Q_{1} \neq 0 \)
\( \sigma_{2} \neq 0, Q_{2} \neq 0 \)
(B) \( \sigma_{1} \neq 0, Q_{1}=0 \)
\( \sigma_{2} \neq 0, Q_{2}=0 \)
(C) \( \sigma_{1} \neq 0, Q_{1}=0 \)
\( \sigma_{2}=0, Q_{2}=0 \)
(D) \( \sigma_{1}=0, Q_{1}=0 \)
\( \sigma_{2}=0, Q_{2}=0 \)
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