常采用的两种存储结构是( )。

A．顺序存储结构和链式存储结构

B．散列方法和索引方式

C．链表存储结构和数组

D．线性存储结构和非线性存储结构

The software architecture of a program or computing system is the structure or structures of the system, which comprise software （1）, the externally （2） properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a （3）that enables a software engineer to: analyze the （4） of the design in meeting its stated requirements, consider architectural alternatives at a stage when making design changes is still relatively easy, and reduce the （5） associated with the construction of the software.

4（）

A.changeability

B.effectiveness

C.testability

D.functionality