3. The hierarchical structure of a computer system is usually divided into a microprogramme machine layer, a machine language layer, an operating system layer, an assembly language machine layer, and a high-level language machine layer. The relationship between levels is ( ). A, the upper and lower levels are irrelevant B, the upper layer to achieve the next layer of functional expansion, and the next layer has nothing to do with the previous layer C. The upper layer realizes the function expansion to the next layer, and the next layer is the foundation of the upper layer. D. The upper layer has nothing to do with the next layer, and the next layer is the foundation of the upper layer.

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