Find the foci of the ellipse whose equation is given.
+ 
= 1
A. foci at (-1, 3 - 3
) and (-1, 3 + 3
)
B. foci at (1, 3 - 3
) and (1, 3 + 3
)
C. foci at (2, 3 - 3
) and (2, 3 + 3
)
D. foci at (3, 1 - 3
) and (3, 1 + 3
)
Answer: B
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