The locus of the midpoint of a line segm...

The locus of the midpoint of a line segment that is drawn from a given external point `P` to a given circle with center `O` (where `O` is the orgin) and radius `r` is (a) straight line perpendiculat to `P O` (b) circle with center `P` and radius `r` (c) circle with center `P` and radius `2r` (d) circle with center at the midpoint `P O` and radius `r/2dot`

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