In a relation R = {(a, b) : b- a = 3}, b...

In a relation `R = {(a, b) : b- a = 3}`, `b < 6` is defined on N, then :

A

`(3,6) in R`

B

`(3,8 in R`

C

`(6,9) in R`

D

`(5,9) in R`

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