Which recruitment source generally provides the widest labour market but involves comparatively higher recruitment costs?

Why E is correct National advertisements attract applicants from across the country, increasing the recruitment pool but also increasing advertising costs. Why others are incorrect A Employee referrals are inexpensive and limited to employees' networks. B Transfers involve existing employees. C Promotions are internal recruitment methods. D Campus recruitment targets fresh graduates rather than the widest labour market. IBPS Concept Internal Recruitment: • Transfer • Promotion • Demotion External Recruitment: • Advertisement • Employment Exchanges • Consultants • Campus • Walk-ins