In the Haber process for the manufacture of $NH_3$,which of the following is true?
- A$Mo$ acts as a catalyst and $Fe$ acts as a promoter.
- B$Fe$ acts as a catalyst and $Mo$ acts as a promoter.
- C$Fe$ acts as an inhibitor and $Mo$ acts as a catalyst.
- D$Fe$ acts as a promoter and $Mo$ acts as an autocatalyst.
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