The correct answer is: D. Apprenticeship
An apprenticeship is a system of training a new generation of practitioners of a skill. Apprentices work as assistants to master craftspeople or tradespeople, and receive on-the-job training and a wage. Apprenticeships are typically three to four years long, and at the end of the apprenticeship, apprentices are qualified to work as skilled tradespeople.
Vestibule training is a type of training that takes place in a simulated work environment. This type of training is often used to train employees on new equipment or procedures.
Coaching is a type of training that focuses on helping employees develop their skills and knowledge. Coaches work with employees to set goals, develop plans to achieve those goals, and provide feedback on progress.
Mentoring is a type of training that involves a more experienced employee (the mentor) working with a less experienced employee (the mentee). Mentors provide guidance and support to mentees, and help them develop their skills and knowledge.
In conclusion, the method of training in crafts, trades and technical areas is known as apprenticeship.