Part 4 (in): AISI 1020 Steel (not in shortcut menu) a) A = 5, B = 3.25, C = 6 1.25 .50 B 2.00 2.00 6.00 2.00 2.00 Check: mass = 48.13 lbs 12.00 Check: mass = 58.39 lbs DC 1.25 -9.00 12.00 R3.00 1.25 A b) Save a copy of your previous part and without adding any new features, modify Part 4 as shown below. A = 10, B =5, C = 3.5