Which of the following is a property of a reflexive relation?

If (a, b) ∈ R, then (b, a) ∈ R

If (a, b) ∈ R, then (a, c) ∈ R

(a, a) ∈ R for all a

If (a, a) ∈ R, then (a, b) ∈ R

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