For a hospital to be successful, it needs nurses, physicians, and a variety of technicians. A hospital that attracts and keeps the best of these human resources has an advantage over other hospitals. From the perspective of human resource management, what does it mean to say that these workers are "rare" resources?

High$-$quality employees provide a needed service as they perform many critical functions.

Human resources cannot be imitated.

People with high levels of the skills and knowledge needed for success in a given position are uncommon.

Hospitals tend to be located far away from where people live, so available workers are few.