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
multiprogramming
semaphore
multitasking

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Operating System (OS)
Thrashing

can be caused by poor paging algorithms
can always be avoided by swapping
always occurs on large computers
is a natural consequence of virtual memory systems
None of these

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