If R = {(x, y) : x2 + 3y2 ≤ 8, x, y ∈ Z} is a relation on the set Z of integers, then the domain of R-1 is 

1
{-1, 0, 1}
2
{-2, -1, 1, 2}
3
{0, 1}
4
{-2, -1, 0, 1, 2}

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