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

semaphore
mutual exclusion
multiprogramming
multitasking
None of these

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Operating System (OS)
Identify false statement

You can right click and choose Empty Recycle Bin to clean it at once
You can increase free space of disk by sending files in recycle bin
You can find deleted files in recycle bin
You can restore any files in recycle bin if you ever need

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