Operating System (OS)
User-Friendly Systems are:

easy to develop
required for object-oriented programming
None of these
becoming more common
common among traditional mainframe operating systems

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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
one which is enclosed by a pair of P and V operations on semaphores
a program segment where shared resources are accessed
none is the above

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