Operating System (OS)
A public key encryption system

allows only the correct sender to decode the data
does not encode the data before transmitting it
allows only the correct receiver to decode the data
None of these
allows anyone to decode the transmission

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Operating System (OS)
Thrashing

is a natural consequence of virtual memory systems
always occurs on large computers
can always be avoided by swapping
can be caused by poor paging algorithms
None of these

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Operating System (OS)
The dispatcher

never changes task priorities
actually schedules the tasks into the processor
None of these
puts tasks in I/O wait
is always small and simple

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