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Option a is correct. It is true that file explorer is window's main program to manage files.
File Explorer, formerly Windows Explorer, is a file manager program that comes preinstalled with versions of the Microsoft Windows operating system starting with Windows 95. For accessing the file systems, it offers a graphical user interface. It is also the part of the operating system that displays the taskbar and other user interface elements on the screen. It is possible to control the computer without Windows Explorer active (for instance, on NT-derived versions of Windows, the File Run command and commands entered in a command prompt window will work without it).
The term "Windows Explorer" or "File Explorer" is most frequently used to refer to the operating system's file management feature. The Explorer process also houses the file type associations (based on filename extensions) and the operating system's search functionality. It is also in charge of displaying the desktop icons, the Start Menu, the Taskbar, and the Control Panel. The Windows shell refers to all of these characteristics as a whole.
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