Operating System (OS)
Memory management is :

replaced with virtual memory on current systems
not used on multiprogramming systems
None of these
not used in modern operating system
critical for even the simplest operating systems

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Operating System (OS)
A critical region is

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

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Operating System (OS)
System generation:

varies in difficulty between systems
is always quite simple
requires extensive tools to be understandable
is always very difficult
None of these

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