If R = {x, y) : x, y Î Z, x2 + y2 £ 4} is a relation in z, then domain of R is

If R = {x, y) : x, y Î Z, x2 + y2 £ 4} is a relation in z, then doma

1.	If R = {x, y) : x, y Î Z, x2 + y2 £ 4} is a relation in z, then domain of R is
A.	{0, 1, 2}
B.	{– 2, – 1, 0}
C.	{– 2, – 1, 0, 1, 2}
D.	none of these
Answer» D. none of these