The equation of the circle which touches both the axes and whose radius is $a$ is
- A$x^2 + y^2 - 2ax - 2ay + a^2 = 0$
- B$x^2 + y^2 + ax + ay - a^2 = 0$
- C$x^2 + y^2 + 2ax + 2ay - a^2 = 0$
- D$x^2 + y^2 - ax - ay + a^2 = 0$
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