$Na_2S + Na_2[Fe(CN)_5NO] \longrightarrow Na_4[Fe(CN)_5NOS]$; what are the oxidation numbers of $Fe$ in the reactant complex and the product complex,respectively?
- A$2, 1$
- B$2, 2$
- C$2, 3$
- D$3, 3$
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