_________ refers to a source of recruitment in which the business organisation keep a database of applicants and call them when need arises :

Casual Callers

The correct answer is option (4) : 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 manpower. A list of such job-seekers can be prepared and can be screened to fill the vacancies as they arise. The major merit of this source of recruitment is that it reduces the cost of recruiting workforce in comparison to other sources

Labour Contractors: Labour contractors maintain close contacts with labourers and they can provide the required number of unskilled workers at short notice. Workers are recruited through labour contractors who are themselves employees of the organisation

Placement Agencies and Management Consultants: In technical and professional areas, private agencies and professional bodies appear to be doing substantive work. Placement agencies provide a nationwide service in matching personnel demand and supply. These agencies compile bio-data of a large number of candidates and recommend suitable names to their clients. Such agencies charge fee for their services and they are useful where extensive screening is required. These professional recruiters can entice the needed top executives from other companies by making the right offers.

Labour Contractors: Labour contractors maintain close contacts with labourers and they can provide the required number of unskilled workers at short notice. Workers are recruited through labour contractors who are themselves employees of the organisation