A charge nurse is providing an in-service to a group of staff nurses about unexpected events. Which of the following should the nurse include in the teaching as an example of a sentinel event?

A client fell out of bed and fractured their hip.

A client was prescribed a medication they were allergic to, but the prescription was canceled before the medication was given.

A client was almost given another client's medication.

A client had bowel surgery and died from sepsis.