If the radius of a circle is $a$ and it touches the $X$-axis at the origin,then its equation is....
- A$x^2 + y^2 + ax = 0$
- B$x^2 + y^2 \pm 2ya = 0$
- C$x^2 + y^2 \pm 2xa = 0$
- D$x^2 + y^2 + ya = 0$
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