Direct Energy Deposition (DED) is a 3D printing technique where focused thermal energy, typically from a laser or electron beam, is used to melt material, which is then deposited layer by layer to build up a part. The process is commonly used for repairing or adding material to existing parts.
Option (A) refers to a different technique, droplet deposition, which is used in other 3D printing methods. Option (B) describes selective laser sintering (SLS), and option (D) does not accurately describe DED.