If A = {x ? C: x2 = 1} and B = {x ? C: x4 = 1}, then A ? B is equal to

If A = {x ? C: x2 = 1} and B = {x ? C: x4 = 1}, then A ? B is equal

1.	If A = {x ? C: x2 = 1} and B = {x ? C: x4 = 1}, then A ? B is equal to
A.	{-i, i}
B.	{-1, 1}
C.	{-1, 1, i, -i}
D.	none of these
Answer» B. {-1, 1}

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