Let $A B C D$ be a quadrilateral such that there exists a point $E$ inside the quadrilateral satisfying $A E=B E=C E=D E$. Suppose $\angle D A B, \angle A B C, \angle B C D$ is an arithmetic progression. Then the median of the set $\{\angle D A B, \angle A B C, \angle B C D\}$ is

  • [KVPY 2020]
  • A

    $\frac{\pi}{6}$

  • B

    $\frac{\pi}{4}$

  • C

    $\frac{\pi}{3}$

  • D

    $\frac{\pi}{2}$

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