If one of the lines of the pair $ax^{2}+2hxy+by^{2}=0$ bisects the angle between the positive direction of the axes,then $a, b,$ and $h$ satisfy the relation:
- A$a+b=2|h|$
- B$a+b=-2h$
- C$a-b=2|h|$
- D$(a-b)^{2}=4h^{2}$
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