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 is :

Question

( A ) an equivalence relation
( B ) reflxvive and transitive only
( C ) reflexive and symmetric only
( D ) reflexive only