Which of these statements about $[Co(CN)_6]^{3-}$ is true?

  • A
    $[Co(CN)_6]^{3-}$ has four unpaired electrons and will be in a high-spin configuration.
  • B
    $[Co(CN)_6]^{3-}$ has no unpaired electrons and will be in a high-spin configuration.
  • C
    $[Co(CN)_6]^{3-}$ has no unpaired electrons and will be in a low-spin configuration.
  • D
    $[Co(CN)_6]^{3-}$ has four unpaired electrons and will be in a low-spin configuration.

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