A. Organize fragmented files
B. Delete unnecessary and temporary files
C. Format the hard drive
D. Optimize system performance

Solution

B. Delete unnecessary and temporary files

Explanation

<p><span style="font-size: 14px;">The primary function of Disk Cleanup in Windows is to free up disk space by finding and safely removing unnecessary files.</span></p><p><span style="letter-spacing: 0.01rem;">✅ It deletes things like:</span></p><ul><li><span style="font-size: 14px;">Temporary files</span></li><li><span style="font-size: 14px;">System cache files</span></li><li><span style="font-size: 14px;">Recycle Bin contents</span></li><li><span style="font-size: 14px;">Old Windows update files</span></li><li><span style="font-size: 14px;">Thumbnails and log files</span></li></ul>