Name the method of External recruitment in which business organisations keep a database of unsolicited applicants, make a list of job seekers and fill the vacancies as and when they arise.

Casual callers

The correct answer is option (1) : Casual callers

The method of external recruitment described, in which business organizations keep a database of unsolicited applicants, make a list of job seekers, and fill vacancies as and when they arise, is known as "Casual Callers." Casual callers are individuals who submit their resumes or applications to a company without a specific job opening being advertised. The company maintains a database of these unsolicited applications and may refer to it when job vacancies occur.