Operating System (OS)
If you do not know which version of MS-DOS you are working with, which command will you use after having booted your operating system?

VER command
None of these
FORMAT command
DISK command
DIR command

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Operating System (OS)
A critical region is

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 that often causes unexpected system crashes
none is the above
a program segment where shared resources are accessed

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