A nurse manager conducts rounds on the unit and discovers that expired stock medicine is still in the cabinet despite the e-mail that was sent stating that it had to be discarded. The staff nurse dress code is not being adhered to as requested in the same e-mail. Several staff nurses deny having received the e-mail. Which action should the nurse manager take?

A) Close the staff lounge.
B) Enforce a stricter dress code.
C) Include the findings on each staff member's annual evaluation.
D) Place a hard copy of announcements and unit policies in each staff member's mailbox.