A user's Windows 10 workstation with an HDD is running really slowly. The user has opened, closed, and saved many large files over the past week. Which of the following tools should a technician use…

Disk Defragmenter (or Optimize Drives in Windows 10) reorganizes fragmented files on an HDD into contiguous blocks, which reduces the time it takes for the read/write head to access data and significantly improves system performance.

Registry Editor is used to modify the Windows registry and is not a tool for optimizing disk performance or addressing file fragmentation.

System Information provides details about the system's hardware and software configuration but offers no functionality to remediate performance issues related to disk fragmentation.

Disk Cleanup removes unnecessary files to free up disk space but does not address the issue of file fragmentation, which is the primary cause of slow performance from scattered file pieces.