A block rests on a fixed rough inclined ...

A block rests on a fixed rough inclined place and a horizontal force F is applied to it, as shown in the figure. Which of the following statements are correct?
(A) Normal reaction on the block is `Fsintheta+mgcostheta`
(B) The friction force is zero when `Fcostheta=mgsintheta`
(C) The value of limiting friction is `mu(mgsintheta+Fcostheta)`
(D) The value of limiting friction is `mu(mgsintheta-Fcostheta)`

1,2

3,4

2,4

2,3

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