This type of training method is adopted when employees have to handle sophisticated machinery and equipment at their workplace.
Vestibule training
Answer (d) Vestibule training
Explanation: Vestibule training is a preparation technique where students learn on the stimulated equipment or on the actual job, that they will use at work, yet are prepared off the job (maybe in a different room or vestibule). Vestibule preparing is essential when it’s excessively exorbitant or dangerous to prepare employees at work.