A nurse is teaching a newly licensed nurse about insulin storage. Which of the following statements by the newly licensed nurse indicates an understanding of the teaching?

"I can keep the current vial of insulin in use stored at room temperature."

"I will store unopened vials of insulin in the freezer."

"I will return any unused vials of insulin to the pharmacy once they have been on the unit for 1 month."

"I will discard the current vial of insulin after six doses have been withdrawn."