Analyze the alternatives below, it is INCORRECT to state that: There may be more than one incorrect alternative. a) All members of an ideal truss are pin-connected at their ends. b) In the case of a three-pronged grid, these supports must be located on the same straight line; if so, it will evidently be isostatic. c) Normal efforts are null for grids- d) Except for the weight of each member, all loads on the truss are applied to the nodes. e) Grid is a plane structure subjected to loading perpendicular to its plane. f) Each truss member must be in tension or compression. g) in a generic section of a grate, three simple forces can act: shear force, bending moment and torsion moment. h) The connections between the bars of a grid are rigid, but joints are possible