Operating System (OS)
A critical region is

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

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

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

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