A client is receiving intravenous vancomycin, and the nurse plans to draw blood for a peak and trough to determine the serum level of the drug. Which collection times would provide the best determination of these levels?

One hour after completion of the IV dose and one hour before the next administration of the medication.

Two hours after completion of the IV dose and two hours before the next administration of the medication.

Thirty minutes into the administration of the IV dose and 30 minutes before the next administration of the medication.

Immediately after completion of the IV dose and 30 minutes before the next administration of the medication.