Final answer:
Nursing employees, volunteers, and employees who work on site for a contractor of the hospital may all be part of Hillside Hospitals workforce.
Step-by-step explanation:
The Hillside Hospital workforce may include nursing employees, volunteers, and employees who work on site for a contractor of the hospital. Therefore, the correct answer is d. All of the above. Nursing employees are part of the hospital staff and provide direct patient care. Volunteers may assist in various non-medical tasks, such as administrative work or patient support. Employees who work on site for a contractor of the hospital, such as janitors or food service workers, are considered part of the workforce as well.