Operating System (OS)
Thrashing can be avoided if

All of these
the speed of CPU is increased
the speed of I/O processor is increased
None of these
the pages, belonging to the working set of the programs, are in main memory

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Operating System (OS)
System maintenance:

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

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