question_answer

If P = (1, 0), Q = (- 1, 0) and R = (2, 0) are three given points then the locus .of a point S satisfying the relation \[S{{Q}^{2}}+S{{R}^{2}}=2S{{P}^{2}}\]is

A)  A straight line parallel to x-axis       

B)  A circle through origin

C)  A circle with centre at the origin      

D)  A straight line parallel to y-axis