Operating System (OS)
A critical region is

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

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Operating System (OS)
The function(s) of file system is (are):

to provide for long and short term storage of files with appropriate economic tradeoffs.
All of these
to provide security against loss of information due to system failure
to provide complete file naming freedom to the users and to permit controlled sharing of files
None of these

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