A nurse is preparing to administer vancomycin IV to an adult client. The client asks the nurse if the medication can be given 2 hr earlier. Which of the following statements should the nurse make?

A. Medications can typically be given within a 30-minute window before or after the scheduled time to maintain therapeutic levels. B. While some medications have a grace period after the scheduled time, it is generally not recommended to delay vancomycin for 2 hours. C. Vancomycin should be infused over at least 60 minutes to prevent "Red Man Syndrome" and nephrotoxicity. D. Medications, especially antibiotics, should be given as scheduled to ensure efficacy.