In analyzing the statements, keyboard and IPO principle are correct, while monitor and PowerPoint definitions are incorrect. For the multiple-choice questions, eyes are mostly affected by smartphone use and the correct theory for computer workings is input, processing, and output. Therefore, the answers are: i. correct, ii. wrong, iii. correct, iv. wrong; and for the choices, (a) Eyes and (b) Input, processing and output.
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A keyboard is used to input data into a computer, which makes it an input device.
ii. Monitor is an input device.
Answer: Wrong.