Comprehensive and Detailed in Depth Explanation:

Shadowing is a training technique where a person observes and works alongside a skilled technician or employee to learn by watching and doing. It is often used for short-term learning, such as during onboarding.

Option A (Coaching): Coaching involves ongoing guidance and feedback, not just working alongside someone.

Option B (An internship): An internship is a broader work experience program, not a specific training technique.

Option C (Shadowing): Correct, as it describes learning by observing a skilled worker.