What is the correct order of increasing field strength for the ligands $NH_3$,$en$,$CN^-$,and $CO$?
- A$CO < NH_3 < en < CN^-$
- B$NH_3 < en < CN^- < CO$
- C$CN^- > en > CN^- > NCS^-$
- D$en < CN^- < NH_3 < CO$
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