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
multitasking
semaphore
multiprogramming
None of these

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Operating System (OS)
Memory

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

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