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Which of the following are asynchronous to the operation?

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Which of the following are asynchronous to the operation?

(a) interrupts

(b) software

(c) DMA

(d) memory

I have been asked this question at a job interview.

I'd like to ask this question from Introduction of Interrupts in chapter Interrupts and Exceptions of Embedded Systems

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Correct choice is (a) interrupts

For explanation: The interrupts are asynchronous to the operation and therefore can be used with systems that are the event as opposed to the time driven.

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