alleryA relation $R$ on a set $A$ is reflexive if:
A$(a,a)\in R$ for every $a\in A$
B$(a,b)\in R \Rightarrow (b,a)\in R$
C$(a,b),(b,c)\in R \Rightarrow (a,c)\in R$
D$R$ is empty
Answer & Solution
Correct answer: A. $(a,a)\in R$ for every $a\in A$
Reflexive means every element relates to itself: (a,a) ∈ R for all a ∈ A.
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