While checking the client's medication administration record, it was determined the client received the wrong medication. Which action should the nurse implement first?

A. Completing an incident report is important but comes after ensuring the client's safety. B. The priority is assessing the client for any adverse reactions or complications related to the incorrect medication. C. Notifying the nurse manager should follow after the assessment and client stabilization. D. The provider should be notified after assessing the client and identifying any clinical concerns.