$ABCD$ is a beam of length $5l$ which is supported at $B$ and $C$ (having supported length $BC =$$1)$ and having two equal overhangs $AB$and 

• • 1

    at $B$ and $C$

  • 2

    at the mid point of $BC$

  • 3

    nowhere in the beam 

  • 4

    at the mid point of $AB$and $CD$