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I/O hardware contains ____________

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I/O hardware contains ____________

(a) Bus

(b) Controller

(c) I/O port and its registers

(d) All of the mentioned

I got this question in examination.

I'm obligated to ask this question of I/O Subsystem topic in section Mass-Storage Structures of Operating System

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Right answer is (d) All of the mentioned

Easiest explanation - None.

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