The parabola with directrix $x+2y-1=0$ and focus $(1,0)$ is

  • A
    $4x^2-4xy+y^2-8x+4y+4=0$
  • B
    $4x^2+4xy+y^2-8x+4y+4=0$
  • C
    $4x^2+4xy+y^2+8x-4y+4=0$
  • D
    $4x^2-4xy+y^2-8x-4y+4=0$

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