A uniform metal chain is placed on a rough table such that one end of chain hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is

  • A

    $\frac{3}{4}$

  • B

    $\frac{1}{4}$

  • C

    $\frac{2}{3}$

  • D

    $\frac{1}{2}$

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