Final answer:
Susan is performing the staffing function in management, which involves recruiting and selecting suitable candidates for job vacancies.
Step-by-step explanation:
Susan's job involves recruiting eligible people for a business by identifying the task requirements and recruiting candidates to fill a vacancy. This is staffing, which is one of the key management functions alongside planning, organizing, directing, and controlling. Staffing includes the process of personnel selection, where recruiting personnel within the company like Susan recruit and select the best candidates for the job. It may involve training to develop the necessary skills if the candidate's personality is a good fit for the company culture, as skills are teachable while personality traits are less malleable.