The intercept on the line $y = x$ by the circle $x^2 + y^2 - 2x = 0$ is $AB$. The equation of the circle with $AB$ as a diameter is . . . . . .

  • A
    $x^2 + y^2 + x + y = 0$
  • B
    $x^2 + y^2 - x - y = 0$
  • C
    $x^2 + y^2 - 3x + y = 0$
  • D
    $x^2 + y^2 + 3x - y = 0$

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