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2. A horizontal force of 10 N pushes a 0.5-kg block against a vertical wall. The book is initially at rest. If the static coefficient of friction (μs) is 0.6 and the kinetic coefficient of friction  (μk) is 0.4, which of the following is true?
(A) The frictional force is 4.9 N
(B) The frictional force is 6.0 N
(C) The frictional force is 4.0 N
(D) The normal force is 4.9 N
(E) The normal force is 10.9 N.