Operating System (OS)
A relationship between processes such that each has some part (critical section) which must not be executed while the critical section of another is being executed, is known as

None of these
mutual exclusion
multitasking
multiprogramming
semaphore

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Operating System (OS)
System generation:

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

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