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Which of the following includes its own I/O routine?

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Which of the following includes its own I/O routine?

(a) hardware

(b) kernel

(c) operating system

(d) application manager

I got this question by my school teacher while I was bunking the class.

My enquiry is from Operating Systems in chapter Real Time Operating systems of Embedded Systems

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Right option is (c) operating system

The best I can explain: An operating system is a software which includes its own I/o routine in order to drive the serial ports and the parallel ports.

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