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Which of the following are identity rela...

Which of the following are identity relations on set `A={1,2,3}`
`R_(1)={(1,1),(2,2)},R_(2)={(1,1),(2,2),(3,3),(1,3)},R_(3)={(1,1),(2,2),(3,3)}`

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The relation `R_(3)` is identity relation on set A.
`R_(1)` is not identity relation set A as `(3,3)!in R_(1)`
`R_(2)` is not identity relation on set A as `(1,3) epsilonR_(2)`
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