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Select the correct cell reaction of the cell \( \mathrm{Ag}(s)\left|\mathrm{Ag}^{+}(a q) \| \mathrm{Cu}^{2+}(a q)\right| \mathrm{Cu}(s) \) :
(a) \( 2 \mathrm{Ag}(s)+\mathrm{Cu}(s) \longrightarrow \mathrm{Cu}^{+2}(a q)+2 \mathrm{Ag}^{+}(a q) \)
(b) \( \mathrm{Cu}(s)+2 \mathrm{Ag}^{+}(a q) \longrightarrow \mathrm{Cu}^{2+}(a q)+2 \mathrm{Ag}(s) \)
(c) \( 2 \mathrm{Ag}(s)+\mathrm{Cu}^{2+}(a q) \longrightarrow \mathrm{Cu}(s)+2 \mathrm{Ag}^{+}(a q) \)
(d) \( \mathrm{Cu}^{2+}(a q)+2 \mathrm{Ag}^{+}(a q) \longrightarrow 2 \mathrm{Ag}(s)+\mathrm{Cu}(s) \)
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