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
users can create system programs and run them as commands
the command set being common across different hardware configurations

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Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

None of these
swapping a process to the disk
bring processes from the disk to the main memory
assigning ready process to the CPU
suspending some of the processes when the CPU load is high

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Operating System (OS)
Trojan-Horse programs

are legitimate programs that allow unauthorized access
usually are immediately discovered
are hidden programs that do not show up on the system
do not usually work
None of these

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