3.
Let R = { ( 3 , 3 ) , ( 6 , 6 ) , ( 9 , 9 ) , ( 12 , 12 ) , ( 6 , 12 ) , ( 3 ,9 ) , ( 3, 12 ) , ( 3 , 6 ) } be a relation on the set A= {3, 6, 9, 12}. The relation R is :
A:
an equivalence relation
B:
reflexive and symmetric
C:
reflexive and transitive
D:
only reflexive
The answer is:
C
