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Let A={1,2,3,......,} and the relation R...

Let `A={1,2,3,......,}` and the relation R defined as (a, b) R (c,d) if `a+d=b+c` be an equivalence relation. Then, the equivalence class containing [(2,5)] is:

A

`{(5,2)}`

B

`{(5,2),(3,4),(4,3)}`

C

`{(1,4),(2,5),(3,6),(4,7),(5,8),(6,9)}`

D

`{(6,3),(7,4),(8,5),(9,6),(4,1)}`

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