Which of the following complexes represents maximum stability?

  • A
    $[Co(CN)_6]^{3-}$
  • B
    $[Co(H_2O)_6]^{3+}$
  • C
    $[Co(CN)_6]^{4-}$
  • D
    $[Co(C_2O_4)_3]^{3-}$

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