In which of the following complexes will the $CFSE$ (Crystal Field Stabilization Energy),$\Delta_0$ be equal to zero?
- A$[Fe(NH_3)_6]Br_2$
- B$[Fe(en)_3]Cl_3$
- C$K_4[Fe(CN)_6]$
- D$K_3[Fe(SCN)_6]$
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