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

multiprogramming
semaphore
mutual exclusion
None of these
multitasking

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Operating System (OS)
A Processor

is a sequence of instructions
is a device that performs a sequence of operations specified by instructions in memory.
None of these
is typically characterized by interactive processing and time of the CPU
is the device where information is stored

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