The equation of the pair of straight lines perpendicular to the pair $ax^2 + 2hxy + by^2 = 0$ is

  • A
    $ax^2 - 2hxy + by^2 = 0$
  • B
    $bx^2 + 2hxy + ay^2 = 0$
  • C
    $ay^2 - 2hxy + bx^2 = 0$
  • D
    $ay^2 - bx^2 = 0$

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