A hypothetical galvanic cell is
\(\ominus_{\mathrm{A}_{(\mathrm{s})}}\left|\mathrm{A}^{+}(1 \mathrm{M})\right|\left|\mathrm{B}^{+2}(1 \mathrm{M})\right| \mathrm{B}_{(\mathrm{s})}^{\oplus}\)
and emf of cell is positive. What is the possible cell reaction?

1. A \(\mathrm{A}_{(\mathrm{s})}+\mathrm{B}_{(\mathrm{aq})}^{+2} \rightarrow \mathrm{~A}_{(\mathrm{aq})}^{+1}+\mathrm{B}_{(\mathrm{s})}\)
2. B \(2 \mathrm{~A}_{(\mathrm{s})}+\mathrm{B}_{(\mathrm{aq})}^{+2} \rightarrow 2 \stackrel{+}{\mathrm{A}}_{(\mathrm{aq})}^{1}+\mathrm{B}_{(\mathrm{s})}\)
3. C \(\mathrm{A}_{(\mathrm{s})}+2 \mathrm{~B}_{(\mathrm{aq})}^{+2} \rightarrow \mathrm{~A}_{(\mathrm{aq})}^{+1}+2 \mathrm{~B}_{(\mathrm{s})}\)
4. D \(2 \mathrm{~A}_{(\mathrm{aq})}^{+}+\mathrm{B}_{(\mathrm{s})} \rightarrow 2 \mathrm{~A}_{(\mathrm{s})}+\stackrel{+2}{\mathrm{~B}}_{(\mathrm{aq})}\)