If a * b = b* a ∀ a, b, ∈ A, then the binary operation * on A is said to be what?

related to an answer for: If (a ∗ b) ∗ c = a ∗ (b ∗ c), ∀ a, b, c, ∈ A, then the binary operation * on A is said to be what?

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