A nurse is teaching a newly licensed nurse about expired medications. Which of the following instructions should the nurse include in the teaching?

A. Expired medications should be returned to the pharmacy for proper disposal or replacement. B. Expired medications should not be placed back in the medication cart, as they may not be safe for administration. C. Flushing medications down the toilet is not recommended, as it can affect the environment. D. Notifying the provider is unnecessary unless the expired medications are essential for the client's treatment.