If a complex number $z = x + iy$ is taken such that the amplitude of the fraction $\frac{z - 1}{z + 1}$ is always $\frac{\pi}{4}$,then:

  • A
    $x^2 + y^2 + 2y = 1$
  • B
    $x^2 + y^2 - 2y = 0$
  • C
    $x^2 + y^2 + 2y = -1$
  • D
    $x^2 + y^2 - 2y = 1$

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