ABC Builders Pvt Ltd has to deliver the villas to its buyers for possession on time. Due to this, there is sudden increase in workload. Therefore, the company needs to arrange workers to work at the construction site on an urgent basis.
The source of recruitment which may be used by the company to tap the casual vacancy is:

Direct recruitment

The correct answer is option 1- direct recruitment.

If the company needs to quickly fill casual vacancies due to the sudden increase in workload, and it chooses to directly hire individuals without involving any intermediaries, then it is indeed a case of "Direct recruitment."

Under the direct recruitment, a notice is placed on the notice-board of the enterprise specifying the details of the jobs available. Job seekers assemble outside the premises of the organisation on the specified date and selection is done on the spot. The practice of direct recruitment is followed usually for casual vacancies of unskilled or semi-skilled jobs. Such workers are known as casual or ‘badli’ workers and they are paid remuneration on daily wage basis. This method of recruitment is very inexpensive as it does not involve any cost of advertising the vacancies. It is suitable for filling casual vacancies when there is a rush of work or when some permanent workers are absent.