Which of the following is/are true? In a plane, the locus of points:
I. equidistant from a straight line is a circle radius d where d is the distance between the point and the straight line.
II. equidistant from two given points P and Q is a circle of radius |PQ|.
III. equidistant from two points is the perpendicular bisector of the line joining the two points.
Answer: D
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