Operating System (OS)
Which type of command requires additional files to perform specific operations?

External commands
Internal commands
Valuable commands
Primary commands

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Operating System (OS)
The necessary conditions needed before deadlock can occur?

No Mutual Exclusion, Hold and wait, Preemption, Circular Wait
Mutual Exclusion, Hold and wait, Preemption, No Circular Wait
Mutual Exclusion, No Hold and wait, Preemption, Circular Wait
Mutual Exclusion, Hold and wait, No Preemption, Circular Wait

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Operating System (OS)
A critical region is

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