If $(0, 4)$ and $(0, 2)$ are the vertex and focus of a parabola respectively,then what is its equation?

  • A
    $y^2 + 8x = 32$
  • B
    $y^2 - 8x = 32$
  • C
    $x^2 + 8y = 32$
  • D
    $x^2 - 8y = 32$

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