Which tool should be utilized to safely remove unnecessary files and improve system performance?

The Disk Cleanup utility is specifically designed to help users manage disk space by removing unnecessary files from their system. These files can include temporary files, system files, empty the Recycle Bin, and other items that are no longer needed. By freeing up space on the hard drive, the Disk Cleanup utility can help improve system performance, as it allows the operating system to access data more efficiently.

In contrast, the defragmentation tool primarily focuses on rearranging fragmented data on the hard drive to enhance read and write speeds, but it does not remove files. A disk imaging tool is used for creating a complete backup of the data on a disk, and while it is important for backup purposes, it does not address unnecessary files directly. The Task Scheduler is a utility for automating tasks and running scripts or programs at scheduled times, but it does not have functionalities related to removing files or improving disk space. Therefore, the Disk Cleanup utility is the most appropriate choice for safely removing unnecessary files and enhancing system performance.