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For the galvanic cell reaction, expressed below using shorthand notation, what half-reaction occurs at the cathode?

$$Zn(s) | Zn^{2+}(aq) || Ni^{2+}(aq) | Ni(s)$$

A

$Ni(s) → Ni^{2+}(aq) + 2 e^{-}$

B

$Zn(s) → Zn^{2+}(aq) + 2 e^{-}$

C

$Ni^{2+}(aq) + 2 e^{-} → Ni(s)$

D

$Zn^{2+}(aq) + 2 e^{-} → Zn(s)$

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