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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