$A$ circular park of radius $20 \, m$ is situated in a colony. Three boys Ankur,Syed and David are sitting at equal distances on its boundary,each having a toy telephone in his hands to talk to each other. Find the length of the string of each phone.

  • A
    $30 \sqrt{3} \, m$
  • B
    $10 \sqrt{3} \, m$
  • C
    $20 \sqrt{3} \, m$
  • D
    $23 \sqrt{3} \, m$

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