正解:A
To track system messages and alerts effectively and observe trends over time, the best tool to use are system logs. Logs record events and data during the operation of a system or software application, allowing a network administrator to review historical data, spot patterns, or identify recurrent issues. This is essential for troubleshooting, auditing, and maintaining the overall health of the IT infrastructure.
References:The importance of using logs for monitoring and tracking system activities is covered under the
"Networking and Connectivity" section of CompTIA IT Fundamentals, as well as various sections discussing system maintenance and troubleshooting across CompTIA certification study materials.