Operating System (OS)
Link encryption

is used only to debug
can not be used in a public network
is less secure than end-to-end encryption
is more secure than end-to-end encryption
None of these

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Operating System (OS)
A critical region is

a program segment where shared resources are accessed
one which is enclosed by a pair of P and V operations on semaphores
a program segment that often causes unexpected system crashes
a program segment that has not been proved bug-free
none is the above

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