Identify the reaction from the following for which the standard electrode potential of the $Cu^{+2}/Cu$ electrode is $0.34 \text{ V}$ with respect to the $SHE$?
- A$Cu \rightarrow Cu^{+2} + 2e^-$
- B$Cu^{+2} + 2e^- \rightarrow Cu$
- C$Cu^+ \rightarrow Cu^{+2} + e^-$
- D$Cu^{+3} \rightarrow Cu^{+2} + e^-$
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