Arrange the following in the increasing order of complexity.

A. I/O Module

B. I/O processor

C. I/O Channel

D. DMA

1. AD, C, B, A
2. BC, D, A, B
3. CA, B, C, D
4. DA, D, C, B

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Correct answer: D. A, D, C, B

Explanation

Complexity increases from a simple I/O module, to a DMA controller, to an I/O channel, to a full I/O processor.