The equation of the circle passing through $(1,0)$ and $(0,1)$ and having the smallest possible radius is:

  • A
    $2x^2 + y^2 - 2x - y = 0$
  • B
    $x^2 + 2y^2 - x - 2y = 0$
  • C
    $x^2 + y^2 - x - y = 0$
  • D
    $x^2 + y^2 + x + y = 0$

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