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R = {(1, 2), (2, 1)} on {1, 2, 3} is
AAn equivalence relation on {1, 2, 3}
BReflexive and symmetric but not transitive
CSymmetric but neither reflexive nor transitive
DTransitive but neither reflexive nor symmetric
Answer & Solution
Correct answer: C. Symmetric but neither reflexive nor transitive
Each pair has its reverse, but (1, 1) is missing even though (1, 2) and (2, 1) are present, and no diagonal pair appears.
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