In which of the following compounds,the transition metal is in oxidation state of zero?

  • A
    $[Fe(H_2O)_3(OH)_3]$
  • B
    $[Ni(CO)_4]$
  • C
    $[Fe(H_2O)_6]SO_4$
  • D
    $[Co(NH_3)_6]Cl_3$

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