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If the number of cycles spent busy – waiting is not excessive, then ____________

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If the number of cycles spent busy – waiting is not excessive, then ____________

(a) interrupt driven I/O is more efficient than programmed I/O

(b) programmed I/O is more efficient than interrupt driven I/O

(c) both programmed and interrupt driven I/O are equally efficient

(d) none of the mentioned

I got this question in an online interview.

This intriguing question comes from I/O System topic in portion I/O Systems of Operating System

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Correct option is (b) programmed I/O is more efficient than interrupt driven I/O

The explanation is: None.

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