Which of the following statements is correct? (1) If there is only axial force on each cross-section of the rod, then only tensile or compressive deformation exists for the rod. (2) If there is only torque on each cross-section of the rod, then only torsional deformation exists for the rod. (3) If there is only bending moment on each cross-section of the rod, then only bending deformation exists for the rod. (4) If there is only normal stress and no shear stress on each cross-section of the rod, then there will not be torsional deformation.