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The directory structure used in Unix file system is called

  • A.Hierarchical directory
  • B.Tree structured directory
  • C.Directed acyclic graph
  • D.Graph structured directory

Answer: C

The directory structure used in the Unix file system is a directed acyclic graph. Unix allows a file to have several links, so one file can appear in more than one directory, but cycles are not permitted. This is more general than a plain tree, where each file has a single parent.

A hierarchical or tree structured directory does not allow sharing of files through links, and a general graph structure would allow cycles, which Unix does not allow.

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