Which one is correct group reagent for g...

Which one is correct group reagent for group cations?

`Mn^(2+)CO^(2+)Zn^(2+)Ni^(2+):HCl+H_(2)S`

`Mn^(2+)Co^(2+)Zn^(2+)Ni^(2+),dil.HCl`

`Mn^(2+)Co^(2+)Zn^(2+)Ni^(2+),NH_(4)Cl+NH_(4)OH`

`Mn^(2+)Co^(2+)Zn^(2+)Ni^(2+),NH_(4)Cl+NH_(4)OH+H_(2)S`

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