Which among the following is an example of a metal-metal ion electrode?
- A$Fe^{3+} (aq.), Fe^{2+} (aq.) \mid Pt$
- B$Cl^{-} (aq.) \mid AgCl (s) \mid Ag$
- C$Zn^{2+} (aq.) \mid Zn (s)$
- D$OH^{-} (aq.) \mid O_{2} (g), Pt$
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