You need to perform a cold-forming operation which involves reducing the diameter of a rod from 3cm to 2cm in a single pass. What is the associated percent cold work? 56%25%50%67% roughly equivalent from a cost standpoint. Which material would you use if you needed to maximize yield strength in your as-formed part? material \#1: annealed pure Cu, average grain diameter 100 microns material \#2: annealed pure Cu, average grain diameter 10 microns material \#3: annealed 50Cu50Ni, average grain diameter 100 microns material \#4: annealed 50Cu50Ni, average grain diameter 10 microns