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Block `A` of mass `2kg` is placed over a block `B` of mass `8kg` . The combination is placed on a rough horizontal surface. If `g=10ms^(-2)` , coefficient of friction between `B` and floor `=0.5` , coefficient of friction between `B` and floor `=0.5` , coefficient of friction between `A` and `B=0.4` and a horizontal force of `10N` is applied on `8kg` block, then the force of friction between `A` and `B` is.

A

100N

B

40N

C

50N

D

zero

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