Question 4 4.2 What is a major advantage of the unused powder in the build chamber after a 3D Printing (3DP) job is complete? (7) 4.3 Based on Electroplating and Electroless Nickel: What is the main advantage of Electroless Nickel plating over conventional Electroplating when coating complex, non-flat parts? (8) 4.4 Based Hot Dip Coating (Galvanizing): What is the brittle "intermetallic compound layer" that forms during this process, and why is it essential for the coating's success