$A$ point $P(x, y)$ is such that the sum of squares of its distances from the coordinate axes is equal to the square of its distance from the line $x-y=1$. Then the equation of the locus of $P$ is

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

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