Operating System (OS)
If you want to execute more than one program at a time, the systems software you are using must be capable of:

multitasking
compiling
word processing
None of these
virtual memory

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Operating System (OS)
Scheduling is

the same regard-less of the purpose of the system
not required in uniprocessor systems
allowing jobs to use the processor
None of these
unrelated to performance consideration

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