If we define a relation R on the set N × N as (a, b) R (c, d) ⇔ a + d = b + c for all (a, b), (c, d) ∈ N × N, then the relation is

If we define a relation R on the set N × N as (a, b) R (c, d) ⇔ a +

1.	If we define a relation R on the set N × N as (a, b) R (c, d) ⇔ a + d = b + c for all (a, b), (c, d) ∈ N × N, then the relation is
A.	symmetric only
B.	symmetric and transitive only
C.	equivalence relation
D.	reflexive only
Answer» D. reflexive only

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