The molecular formula of tris(ethylenediamine)cobalt$(III)$ sulfate is:

  • A
    $[Co(en)_2SO_4]$
  • B
    $[Co(en)_3SO_4]$
  • C
    $[Co(en)_3]_2(SO_4)_3$
  • D
    $[Co(en)_3]SO_4$

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