A system's architecture is a representation of a system in which there is a mapping of （） onto hardware and software components, a mapping of the （） onto the hardware architecture, and a concern for the human interaction with these components. That is, system architecture is concerned with a total system, including hardware, software, and humans. Software architectural structures can be divided into three major categories, depending on the broad nature of the elements they show. 1)（） embody decisions as a set of code or data units that have to be constructed or procured. 2)（请作答此空） embody decisions as to how the system is to be structured as set of elements that have runtime behavior and interactions. 3)（）embody decisions as to how the system will relate to nonsoflware structures in its environment (such as CPUs, file systems, networks, development teams, etc.).

A

Decompostion structures

B

Layer structures

C

Implementation structures

D

Component-and-connector structures

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答案：

D

根据题目描述，软件架构结构分为三个主要类别，而其中一个类别是“Component-and-connector structures”，它涉及到系统如何结构化为一组具有运行时行为和交互的元素，这与题目中的描述相符。因此，答案为D。