If R = {(x,y), x,y, inZ, x^2 +y^2 le4} i...

If `R = {(x,y), x,y, inZ, x^2 +y^2 le4}` is a relation in set Z, then domain of R is

A

`{0, 1, 2}`

B

`{-2, -1, 0, 1, 2}`

C

`{0, -1, -2}`

D

`{-1, 0, 1}`

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