The locus of the centre of a circle touching both the coordinate axes is
- A$x^2 + y^2 = 0$
- B$x^2 + y^2 = k$ (where $k$ is a non-zero constant)
- C$x^2 - y^2 = 0$
- D$x^2 - y^2 = k$ (where $k$ is a non-zero constant)
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