Operating System (OS)
System maintenance:

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

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Operating System (OS)
Which of the following statement is true.

All of these
None of these
Seek analysis is used for analysing control-unit busy problems.
Thrashing is a natural consequence of virtual memory systems.
The LRU algorithm pages out pages that have been used recently

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