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Which of the following pairs of complexes show different magnetic behaviour? A) [CoF₆]³⁻ and [Co(NH₃)₆]³⁺ B) [Fe(OH₂)₆]³⁺ and [FeF₆]³⁻ C) [Ni(OH₂)₆]²⁺ and [Ni(NH₃)₆]²⁺ D) [Cu(OH₂)₆]²⁺ and [Cu(NH₃)₄]²⁺