Operating System (OS)
You can add or remove program

Both A and B
Add / Remove program from control panel
None of Above
Delete the shortcut icon from desktop

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

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

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