A 12 kip axial load is applied with an eccentricity e=0.375 in to the circular steel rod BC that is free at its top C and fixed at its base B knowing that the stock of rods available for use have diameter in increments of 1/8 in from 1.5 in to 3.0 in determine the lightest rod that can be used if £ =15 ksi use E = 29x10^6 psi