Under this method of recruitment, an organisation maintains a database of unsolicited applicants in their offices.
(a) Labour contractors
(b) Casual callers
(c) Advertising on television
(d) Direct recruitment
Answer (b) Casual callers
Explanation: Casual callers, also called unsolicited applications, are the prospective employees who go to well-renowned associations informally and either mail or drop in their employment forms looking for any open positions.