Redox Reactions

In which of the following reactions H₂O₂ acts as a reducing agent? 1. H₂O₂ + 2H⁺ + 2e⁻ $$\to$$ 2H₂O 2. H₂O₂ - 2e⁻ $$\to$$ O₂ + 2H⁺ 3. H₂O₂ + 2e⁻ $$\to$$ 2OH⁻ 4. H₂O₂ + 2OH⁻ - 2e⁻ $$\to$$ O₂ + 2H₂O