Operating System (OS)
Memory

is a device that performs a sequence of operations specified by instructions in memory.
None of these
is a sequence of instructions
is typically characterized by interactive processing and time-slicing of the CPU
is the device where information is stored

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

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

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