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MS-DOS lets you organise the files on your disk into directories. Directories are a way of dividing your files into convenient groups. A directory may contain any number of files, but it is often more convenient to separate the files into subdirectories.
This method of organising the disk is rather like a tree where the files are the leaves of the tree and the directories are the branches. (The first directory is usually called the “ROOT”).
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What is the “ROOT”?
It is the beginning of the tree.
It is the main directory.
It is the beginning of all directories.
It is the first directory.