Using ANSYS, perform the linear buckling analysis of a slender column made from Structural Steel (E=2e11). The length of the column is 10 meters, and the cross section is rectangular profile of 10 cm x 40 cm. Compute the following: a. The critical buckling force when the column is fixed at one end and free at the other end. The compressive load is located on this free end. Verify the results using the analytical formulation. Submit the 1st buckling mode. b. The critical buckling force when the column is pinned at one end and the compressive load is located on the end with roller support. Verify the results using the analytical formulation. Submit the 1st buckling mode. Note that the slender column can be modeled as either "line" with rectangular profile or 3D solid column.