A server has been operating normally for several months. Users suddenly begin reporting that the server is responding very slowly. Which of the following tools are the BEST choices for the…

Disk defragmenter is a maintenance utility for improving file access on spinning drives and would not help diagnose a sudden, acute performance issue.

Resource Monitor displays live consumption of system resources - CPU, RAM, disk I/O, and network bandwidth - allowing the administrator to immediately identify which resource is saturated and which process is responsible for the slowdown.

Event Viewer records system, application, and security events with timestamps, so the administrator can correlate logged errors or warnings to the moment users first reported slowness, revealing underlying causes such as hardware faults, service crashes, or resource exhaustion events.

Device Manager is used to manage hardware drivers and device status; it does not provide runtime performance data or event history relevant to sudden slowdowns.

System Information displays static hardware and software configuration details but provides no real-time or historical performance data useful for active troubleshooting.

File Manager is used to navigate and manage files and folders and has no diagnostic or monitoring capabilities relevant to server performance issues.