$A$ variable chord is drawn through the origin to the circle $x^2 + y^2 - 2ax = 0$. The locus of the centre of the circle drawn on this chord as diameter is:
- A$x^2 + y^2 + ax = 0$
- B$x^2 + y^2 + ay = 0$
- C$x^2 + y^2 - ax = 0$
- D$x^2 + y^2 - ay = 0$
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