Final answer:
The nurse should delegate the task of taking vital signs to a UAP. Administering medication, developing care plans, and performing medical diagnoses are responsibilities that require a registered nurse or healthcare provider.
Step-by-step explanation:
In an acute care setting, the nurse can delegate the assignment of taking vital signs to a UAP (Unlicensed Assistive Personnel). This task falls within the scope of a UAP's responsibilities, under the direct supervision of a registered nurse. Tasks such as administering medication, developing a patient care plan, and performing a medical diagnosis are outside of a UAP's scope of practice. These are complex assignments that require the advanced knowledge, skills, and decision-making abilities of a registered nurse or a healthcare provider.