The portable jack stand carries a downward load of 600 lbs. How much compressive force is there in each of the four symmetrical legs OA, OB, OC, and OD? Assume that all connections are ball joints and that the only reactions from the ground are equal vertical forces (using symmetry) at A, B, C, and D. Also, neglect the dimensions of the top plate. Use Method of Joints for this problem. 14 in. A 600 lb B C 12 in.- D 10 in.