When troubleshooting an application that is not performing well and occasionally shuts down with no error, the "Performance" tab in Task Manager is the most appropriate tool to use. This tab provides real-time data on CPU, memory, disk, and network usage, which can help identify resource bottlenecks or spikes that could be causing the application to malfunction. Monitoring these metrics while the application is running can offer insights into whether the issue is related to system resources.
* A. Users tab shows which users are currently logged into the system and their resource usage but does not provide detailed performance metrics for troubleshooting application issues.
* B. Services tab shows the status of background services but does not provide direct information about the application's performance.
* D. Startup tab manages which applications start with Windows and their impact on startup time but is not useful for monitoring active application performance.
References:
CompTIA A+ Core 2 (220-1102) Exam Objectives, Section 1.3: Using features and tools of the Microsoft Windows OS, including Task Manager's Performance tab.