Let $O=(0,0)$ : let $A$ and $B$ be points respectively on $X$-axis and $Y$-axis such that $\angle O B A=60^{\circ}$. Let $D$ be a point in the first quadrant such that $A D$ is an equilateral triangle. Then, the slope of $D B$ is

  • [KVPY 2016]
  • A

    $\sqrt{3}$

  • B

    $\sqrt{2}$

  • C

    $\frac{1}{\sqrt{2}}$

  • D

    $\frac{1}{\sqrt{3}}$

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