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

mutual exclusion
multiprogramming
multitasking
None of these
semaphore

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Operating System (OS)
Feed back queue

are very easy to implement
are used to favor real-time tasks
dispatch tasks according to execution characteristics
require manual intervention to implement properly
None of these

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