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.
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
All of these

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Operating System (OS)
A critical region is

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

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