Which of the following statements is/are true for a buffer solution?

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Which of the following statements is/are true for a buffer solution?

1. It is a solution which resists the change in pH at all conditions2. There are two types of buffer only - Acidic and basic3. Ammonium acetate (CH3COONH4) acts as buffer4. All are correct

Which of the following statements is/are true for a buffer solution?