The correct answer is option 4- A-III, B-IV, C-II, D-I.
* Internal Source of recruitment- Transfers.
Transfers: It is an internal Source of Recruitment that means from within the enterprise. There are two important sources of internal recruitment, namely, transfers and promotions. Transfers involves shifting of an employee from one job to another, one department to another or from one shift to another, without a substantive change in the responsibilities and status of the employee. It may lead to changes in duties and responsibilities, working condition etc., but not necessarily salary.
* Unsolicited applicants for a post- Casual Callers.
Casual Callers: Many reputed business organisations keep a database of unsolicited applicants in their offices. Such job-seekers can be a valuable source of man power. A list of such job-seekers can be prepared and can be screened to fill the vacancies as they arise.
* Process of learning and growth- Development.
Development is a process of learning and growth. It is to enable the overall growth of the employee. It is a career oriented process.
* Job oriented process- Training.
Training is a process of increasing knowledge and skills. It is to enable the employee to do the job better. It is a job oriented process. | 
