If the endpoints of a diameter of a circle are $(0, 1)$ and $(1, 1)$,then its equation is . . . .

  • A
    $x^2 + y^2 - x - 2y + 1 = 0$
  • B
    $x^2 + y^2 + x - 2y + 1 = 0$
  • C
    $x^2 + y^2 - x - 2y - 1 = 0$
  • D
    None of these

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