Operating System (OS)
User-Friendly Systems are:

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

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

None of these
the command set being common across different hardware configurations
users can create system programs and run them as commands
flexibility to the users in running lists of commands by simply collecting them in named batch command files
the processing is much faster than would other-wise be the case when user defined commands are used

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Operating System (OS)
A critical region is

a program segment where shared resources are accessed
a program segment that often causes unexpected system crashes
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

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