Figure shows two block A and B pushed ag...

Figure shows two block `A` and `B` pushed against the wall with the force `F` . The wall is smooth but the surfaces in contact of `A` and `B` are rough. Which of the following is true for the system of blocks to be at rest againts wall?

F should be more than the weight of A and B

F should be equal to the weight of A and B

F should be less than the weight of A and B

System cannot be in equilibrium

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