A chocolate candy bar is molded in the shape of a thin rectangular slab with deep groove...

A chocolate candy bar is molded in the shape of a thin rectangular slab with deep grooves. The deep grooves are represented in the figure by the dashed lines AB, AD, and BC, and these grooves allow small bite-size pieces of candy to be easily broken off. Groove AB breaks when the moment about this line is 5 in.b, and grooves AD and BC break when the moment about these lines is 4 in.lb. The candy bar is held along the edge of a table, as shown, and a force F acting in the -z direction is applied at point D. Determine the force F required to break off a piece of candy and which of the grooves AB, AD, or BC will break. Neglect the thickness of the candy bar.