Q.When trainees are trained by Supervisor or trainer or Senior worker, it is called :

Learning at the workplace under a supervisor, trainer or senior worker is apprenticeship training (an on-the-job method), so the answer is (c).

Training methods in the Tamil Nadu HSC Commerce syllabus are split into on-the-job and off-the-job methods:

• Apprenticeship training is an on-the-job method in which the trainee works under an experienced worker, supervisor or trainer for a specified period, combining practical work with instruction, and gradually becomes a skilled worker. …