Give the formulas of the oxocations of the $3d$ series metals.
- A$VO_2^+$ and $VO^{2+}$
- B$TiO^{2+}$ and $TiO_2^{2+}$
- C$CrO_2^{2+}$ and $CrO_4^{2-}$
- D$MnO_4^-$ and $MnO_4^{2-}$
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