Identify the reaction taking place at the anode during the electrolysis of molten $NaCl$.
- A$2 OH^{-} \rightarrow H_2O + \frac{1}{2} O_2 + 2 e^{-}$
- B$2 H^{+} + 2 e^{-} \rightarrow H_2$
- C$Na^{+} + 1 e^{-} \rightarrow Na_{(s)}$
- D$2 Cl^{-} \rightarrow Cl_{2(g)} + 2 e^{-}$
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