The correct option is 2 and 3 only.
Explanation
Training methods for human resource development are broadly classified into On-the-job training (OJT) and Off-the-job training. OJT refers to training provided to a trainee or employee while they are engaged in the actual work process at the workplace, following the principle of "learning while doing."
Statement 1 is Incorrect:
On-the-job training is conducted at the workplace using actual tools, equipment, and documents. Training that is exclusively conducted in classroom settings, conferences, or simulation rooms outside the actual work environment is classified as Off-the-job training.
Statement 2 is Correct:
In the context of vocational education and institutional skill development, the "campus" refers to the training institute or college. Since OJT requires the trainee to be present at an industry site, factory, or office to perform actual work, it constitutes off-campus training relative to the educational institution.
Statement 3 is Correct:
Common methods of OJT include apprenticeships, internships, and coaching. These methods rely heavily on the trainee observing skilled workers (mentors or supervisors) to acquire specific technical skills and then practicing them under supervision.
Key Takeaway:
On-the-job training occurs within the everyday working environment (learning by doing), whereas Off-the-job training occurs away from the actual workplace (learning before doing).