Final answer:
Justin should consider all the listed options: hiring qualified applicants, identifying underlying problems, and consulting with HR to develop a hiring plan for a more efficient department.
Step-by-step explanation:
Justin, as a nurse manager dealing with a high turnover rate among rehab-assistants, should consider all the options listed to have a more efficient department. He should replace staff with only qualified applicants while also determining the underlying problems causing high turnover before hiring new staff. Furthermore, consulting with the human resources department to develop a comprehensive hiring plan would be beneficial. By adopting a holistic approach, Justin can address immediate staffing issues and create a more stable and productive work environment.