$A$ weightless rod is acted on by upward parallel forces of $2N$ and $4N$ ends $A$ and $B$ respectively. The total length of the rod $AB = 3m$. To keep the rod in equilibrium a force of $6N$ should act in the following manner:

  • A

    Downwards at any point between $A$ and $B.$

  • B

    Downwards at mid point of $AB.$

  • C

    Downwards at a point $C$ such that $AC = 1m.$

  • D

    Downwards at a point $D$ such that $BD = 1m.$

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