If A = {(x, y) : x2 + y2 = 1; x, y ? R} and B = {(x, y): x2 + y2 = 4; x, y ?R} then

If A = {(x, y) : x2 + y2 = 1; x, y ? R} and B = {(x, y): x2 + y2 =

1.	If A = {(x, y) : x2 + y2 = 1; x, y ? R} and B = {(x, y): x2 + y2 = 4; x, y ?R} then
A.	A ? B = ?
B.	A ? B ? f
C.	A ? B = ?
D.	B ?A = B
Answer» B. A ? B ? f

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