Operating System (OS)
The operating system allows the user to organize the computer's contents in a hierarchical structure of directories that include all of the following except:

System
Drives
Files
Folders

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Operating System (OS)
Under virtual storage,

only the active pages of a program are stored in primary storage
two or more programs are stored concurrently in primary storage
a single program is processed by two or more CPUs
interprogram interference may occur
None of these

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