The equations of the lines represented by the equation $ab(x^2 - y^2) + (a^2 - b^2)xy = 0$ are
- A$ax - by = 0, bx + ay = 0$
- B$ax - by = 0, bx - ay = 0$
- C$ax + by = 0, bx + ay = 0$
- D$ax + by = 0, bx - ay = 0$
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