Find the equation of the pair of straight lines that bisect the angles between the lines represented by $ax^2 + 2hxy + by^2 = 0$.
- A$\frac{x^2+y^2}{a+b} = \frac{xy}{h}$
- B$\frac{x^2+y^2}{a-b} = \frac{xy}{h}$
- C$\frac{x^2+y^2}{a-b} = \frac{h}{xy}$
- D$\frac{x^2-y^2}{a-b} = \frac{xy}{h}$
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