A \( Zn \longrightarrow Zn^{2+} + 2e^- \)
B \( Cu^{2+} + 2e^- \longrightarrow Cu \)
C \( Zn^{2+} + 2e^- \longrightarrow Zn \)
D \( Cu \longrightarrow Cu^{2+} + 2e^- \)
Correct Answer: Option B
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