4. Column(10pts). What will be the two possible failure modes of the aluminum (alloy) column shown right? The column is fixed at its bottom and is braced by cables so as to prevent movement at the top along the x-axis. Determine the largest allowable load P that can be applied, using factor of safety F.S.=3. After calculation, what will be the most possible failure mode of this column? Take Eal=70GPa, y=250MPa, A=7.5(10-m), Ix=60(10-6)m, Iy=20(10-6)m. 5 m (a)