This source of recruitment basically specialises in filling up the vacancies at the middle level and top-level management.
Placement agencies and management consultants
Answer (d) Placement agencies and management consultants
Explanation: A placement consultancy or a recruitment firm acts as a link between the organisations that propositions jobs in different regions and the job seekers. They additionally assist with decreasing the clutter and smooth out the employee hunting for the organisations regardless of how large or little.