A. The Source/Medium report
B. The Browser & OS report
C. The Active Users report
D. The New vs Returning report
Answer: The Browser & OS report
Explanation:
The Browser & OS report is the one that identifies browsers that may have had problems with a website. This report provides information on the different types of browsers and operating systems used by visitors to a website. By analyzing this report, website owners can identify any browsers that may not be compatible with their website, and then take steps to optimize their site for those browsers.