If one of the lines represented by the equation $ax^2 + 2hxy + by^2 = 0$ bisects the angle between the coordinate axes in the first quadrant,then which of the following is true?
- A$a - b = 2|h|$
- B$a + b = -2h$
- C$a + b = 2|h|$
- D$(a - b)^2 = 4h^2$
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