The equation of a circle whose centre is the origin and whose radius is equal to the distance between the lines $x = 1$ and $x = -1$ is:
- A$x^2 + y^2 = 1$
- B$x^2 + y^2 = \sqrt{2}$
- C$x^2 + y^2 = 4$
- D$x^2 + y^2 = -4$
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