Operating System (OS)
A critical region is

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

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

the command set being common across different hardware configurations
None of these
the processing is much faster than would other-wise be the case when user defined commands are used
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

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