Computer Awareness Computer Fundamentals or Terminologies

Which of the following denotes the commutativity of ∨?

1
((α ∧ β) ∧ γ) ≡ (α ∧ (β ∧ γ))
2
((α ∨ β) ∨ γ) ≡ (α ∨ (β ∨ γ))
3
(α ∨ β) ≡ (β ∨ α) 
4
(α ∧ β) ≡ (β ∧ α)

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