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If `R = {( x,y ) : x,y,in Z , x^2 + 3y^2 le 8}` is a relation on the set of integers Z, then the domain `R^(-1)` is :

A

`{-1,0,1}`

B

`{0,1}`

C

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

D

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

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