Operating System (OS)
What is the name of the operating system which was originally designed by scientists and engineers for use by scientists and engineers?

MS DOS
None of these
OS/2
UNIX
XENIX

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

users can create system programs and run them as commands
the command set being common across different hardware configurations
the processing is much faster than would other-wise be the case when user defined commands are used
None of these
flexibility to the users in running lists of commands by simply collecting them in named batch command files

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