GKFix MCQ Question

In which isomer does SO₄²⁻ act as a ligand?

• A. [Co(NH₃)₆]Br₃
• B. [Co(NH₃)₅Br]SO₄
• C. [Co(NH₃)₅(SO₄)]Br
• D. [Co(NH₃)₅Cl]SO₄