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.

A.

I only

B.

II only

C.

III only

D.

I, II and III

Correct answer is C

No explanation has been provided for this answer.