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How does the software trigger an interrupt?

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How does the software trigger an interrupt?

(a) Sending signals to CPU through bus

(b) Executing a special operation called system call

(c) Executing a special program called system program

(d) Executing a special program called interrupt trigger program

This question was addressed to me in an online quiz.

Query is from Process Structures topic in chapter Distributed Communication of Operating System

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Correct answer is (b) Executing a special operation called system call

The best I can explain: None.

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