(a1, a2) ∈R implies that (a2, a1) ∈ R, for all a1, a2∈A. This condition is for which of the following relations?

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(a<sub>1</sub>, a<sub>2</sub>) ∈R implies that (a<sub>2</sub>, a<sub>1</sub>) ∈ R, for all a<sub>1</sub>, a<sub>2</sub>∈A. This condition is for which of the following relations?