Which of the following is a file management tool?

Defrag (Disk Defragmenter) is a disk optimization utility that reorganizes fragmented data on storage media, not a tool for managing individual files.

MSCONFIG (System Configuration) manages startup programs, boot settings, and Windows services, and has no file management capability.

Device Manager is used to view, update, and troubleshoot hardware device drivers, not to manage files or folders.

Windows Explorer (called File Explorer in modern Windows versions) is the primary graphical file management tool, providing a full interface for navigating the file system and performing operations such as copy, move, rename, and delete on files and folders. It is purpose-built for file and directory management on local and network drives, distinguishing it from all other listed utilities.