A 62-year-old man with no documented penicillin allergy undergoes elective colorectal surgery. Prophylactic cefazolin is not administered perioperatively. On postoperative day 3, he develops surgical site infection with fever (38.9°C), tachycardia (HR 112), tachypnea (RR 22), purulent wound drainage, and positive blood cultures for Escherichia coli. A quality improvement review of the surgical service identifies that prophylactic antibiotics were not administered within 60 minutes before incision in 18% of elective colorectal procedures over the past year, despite established institutional protocols. Which of the following best describes the metric being used to assess this gap in care?

1. A)Process measure evaluating adherence to evidence-based perioperative antibiotic prophylaxis guidelinesGABARITO
2. B)Outcome measure comparing surgical site infection rates to national benchmarks
3. C)Structural measure assessing availability of antibiotics in the operating room
4. D)Balancing measure designed to reduce healthcare costs while maintaining quality
5. E)Sentinel event requiring mandatory reporting to The Joint Commission