An occupational health nurse is implementing some tertiary levels of prevention in the workplace. Which of the following interventions are tertiary interventions?

Working with the floor manager to decide on some light duty work for a nurse aide who is recovering from a broken ankle.

Conducting an in-service on using the new patient lift device to prevent back injuries in the nursing staff.

Screening the staff for Tuberculosis (TB) exposure.

Administering the annual flu vaccine to the employees.