If S = {x : x2 + 1 = 0, x is real}, then S is

1.	If S = {x : x2 + 1 = 0, x is real}, then S is
A.	{-1}
B.	{0}
C.	{1}
D.	an empty set
Answer» E.

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If S = {x : x2 + 1 = 0, x is real}, then S is

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