Which of the following formulae is for sodium hexanitrocobaltate$(III)$?

  • A
    $Na_3[Co(NO_2)_6]$
  • B
    $Na_2[Co(NO_2)_6]$
  • C
    $[Co(NaNO_2)_6]$
  • D
    $Na_3[Co(ONO)_6]$

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