Operating System (OS)
The SJF algorithm executes first the job

None of these
that has been in the queue the longest
that last entered the queue
with the least processor needs
that first entered the queue

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Operating System (OS)
System maintenance:

is necessary on all systems, regardless of how good
always requires several programs
is not required if the system is well written
None of these
is usually not necessary

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Operating System (OS)
System generation:

varies in difficulty between systems
None of these
requires extensive tools to be understandable
is always quite simple
is always very difficult

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