The combined equation of a pair of lines passing through the origin and inclined at $60^{\circ}$ and $30^{\circ}$ respectively with the $x$-axis is:
- A$\sqrt{3}(x^2+y^2)=2xy$
- B$\sqrt{3}(x^2+y^2)=4xy$
- C$4(x^2+y^2)=\sqrt{3}xy$
- D$2(x^2+y^2)=\sqrt{3}xy$
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