$A$ coordination complex of type $MX_2Y_2$ ($M$ = metal ion; $X, Y$ = monodentate ligands) can have either a tetrahedral or a square planar geometry. The maximum number of possible isomers in these two cases are respectively:
- A$1$ and $2$
- B$2$ and $1$
- C$1$ and $3$
- D$3$ and $2$
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