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Which of the following is/are buffer sol...

Which of the following is/are buffer solutions?
A) NaCN (2 mole) + HCl (1 mole) in 5L
B) NaCN (1 mole) + HCl (1 mole) in 5L
C) NH3 (2 mole) + HCl (1 mole) in 5L
D) `CH_(3)COOH` (2 mole) + KOH (1 mole) in 5L

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