Answer:
D. Welding.
Step-by-step explanation:
This is said to be a fabrication method which is used in joining metals or materials of such together. Materials like thermoplastics can also be used in welding. Their are different types of welding including gas metallic welding, tungsten gas welding, energy beam welding etc. Its process include welding torch which melts the material and fillet(electrode) to be used while welding.