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

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

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Operating System (OS)
Memory management is :

not used in modern operating system
None of these
replaced with virtual memory on current systems
critical for even the simplest operating systems
not used on multiprogramming systems

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Operating System (OS)
Daisy chain is a device for

connecting a number of devices to a controller
All of these
connecting a number of controllers to a device
None of these
interconnecting a number of devices to a number of controllers

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