4. Which of the following basic assumptions are not used in the calculation of internal forces and displacements of for multi-storey structures? ( A. The internal forces and displacements are...

Extracted text: 4. Which of the following basic assumptions are not used in the calculation of internal forces and displacements of for multi-storey structures? ( A. The internal forces and displacements are calculated by the elastic method B. The stiffness of floor in its own plane is infinite C. The influence of axial deformation and shear deformation is ignored D. All lateral force resisting members work together to distribute load or seismic force according to displacement coordination conditions