Operating System (OS)
Link encryption

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

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Operating System (OS)
A critical region is

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

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