Which of the following statements is correct? (1) The axial force on the cross section of the rod must be perpendicular to the cross section. (2) The shear force on the cross section of the rod must be within the cross section. (3) The vector of torque on the cross section of the rod part must be perpendicular to the cross section. (4) The vector of bending moment on the cross section of the rod part must be parallel to the cross section.