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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