For the reaction: $4Fe + 3O_2 \rightleftharpoons 4Fe^{3+} + 6O^{2-}$,which of the following statements is $NOT$ correct?
- AMetallic iron is a reducing agent.
- B$Fe^{3+}$ is an oxidizing agent.
- CIt is a redox reaction.
- DMetallic iron is reduced by $Fe^{3+}$.
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