In which one of the following is not a buffer solution

In which one of the following is not a buffer solution

(a) 0.8 M H₂S + 0.8 M KHS
(b) 2 M C₆H₅NH₂ + 2 M C₆H₅NH₃⁺Br⁻
(c) 3 M H₂CO₃ + 3 M KHCO₃
(d) 0.05 M KClO₄ + 0.05 M HClO₄

0.05 M KClO₄ + 0.05 M HClO₄

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