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If P = (1,0), Q = (-10) and R = (2, 0) a...

If P = (1,0), Q = (-10) and R = (2, 0) are three given points, then the focus of a given points S satisfy the relation `SQ^(2)+SR^(2) = 2SP^(2)` is a:

A

a straight line parallel to x-axis

B

a circle passing through origin

C

a circle with the centre at the origin

D

a straight line parallel to y-axis

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