correct option is B Neither reflexive, nor irreflexive but transitive
The relation R doesn't contain (4, 4), so R is not reflexive relation.
Since relation R contains (1,1), (2,2) and (3,3).
Therefore, relation R is also not irreflexive.
That R is transitive, can be checked by systematically checking for all (a, b) and (b, c) in R, whether (a, c) also exists in R.
So, option (b) is correct.
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