Three blocks $A, B$ and $C$ are suspended as shown in the figure. Mass of each blocks $A$ and $C$ is $m$. If system is in equilibrium and mass of $B$ is $M$, then :

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  • A

    $M=2 m$

  • B

    $M < 2 m$

  • C

    $M >2 m$

  • D

    $M=m$

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