In the arrangement shown in figure `m_(A)=m_(B) =2 kg`. String is massless and pulley is frictionless. Block B is resting on a smooth horizontal surface, while friction coefficient between blocks A and B is `mu=0.5`. What maximum horizontal force F can be applied so that block A does not slip over the block B? `(g=10 m//s^(2))`
A. 25 N
B. 40 N
C. 30 N
D. 20 N
