The line $ax + by + c = 0$ is a normal to the circle $x^2 + y^2 = r^2$. The portion of the line $ax + by + c = 0$ intercepted by this circle is of length:

  • A
    $r$
  • B
    $r^2$
  • C
    $2r$
  • D
    $\sqrt{r}$

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