For Figure 4, identify the number of plastic hinges to form a collapse mechanism. Determine the collapse load W in terms of the plastic moment of resistance (Mp) of the beam shown in Figure Q4, stating the position of the corresponding plastic hinge(s). W(KN) 2W(kN) B W(KN) + W(KN) + C T Mp Y (m) X+Y (m) 2Mp 2Mp A X X X X