I screwed up high time
The answer is A.
As you can see from the attached image, the two points A and B lies equidistant from the line X = -1, so any point in that line will be equidistant from A and B. hence sufficient.
The second part of the image shows the line Y = -3, the first point C1 is closer to point A but another point C2 is closer to point B. Hence not sufficient
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Last edited by Alara533 on Mon Feb 02, 2009 10:31 am, edited 2 times in total.