EMSTAS Q.117

117Consider the following relations :
R1 (a, b) iff (a + b) is even over the set of integers
R2 (a, b) iff (a + b) is odd over the set of integers.
R3 (a, b) ifa.b > 0 over the set of non zero rational numbers.
R4 (a, b) if I a - b I < = 2 over the set of natural numbers.
Which of the following statements is correct ?

Option : B
Explanation :

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