Which of the following relations is symmetric but neither reflexive nor transitive for a set A= {a, b, c}?

1
R = {(a, b), (b, a), (b, c), (c, b)}
2
R= {(a, a), (a, b), (b, c)}
3
R = {(a, a), (b. b), (c, c)}
4
R= {(a, b), (a, c), (a. d)}

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