Step 1: Concept
Fastening often requires threads to be cut into pre-drilled holes so a bolt can be screwed in.
Step 2: Meaning
Different tools are used for internal versus external threads.
Step 3: Analysis
Tapping is the process of using a "tap" (a hardened screw-like cutter) to create internal threads inside a hole. Cutting external threads on a rod is called "threading" or "die-cutting".
Step 4: Conclusion The process is called tapping.
Final Answer: (B)