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单选题

The purpose of systems design is to specify a(n) (1) ,which defines the technologies to be used to build the proposed information systems. This task is accomplished by analyzing the data models and process models that were initially created during (2) . The(3) is used to establish physical processes and data stores across a network .To complete this activity, the analyst may involve a number of system designers and (4) ,which maybe involved in this activity to help address business data,process,and location issues.The key inputs to this task are the facts, recommendations,and opinions that are solicited from var1ous sources and the approved (5) from the decision analysis phase.

A
entity-relation ship diagram
B
physical data flow diagram
C
data flow diagram
D
physical database model
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答案:

B

解析:

根据题目描述,系统设计的目的是确定一种应用架构,该架构涉及到在网络上建立物理流程和数据存储的任务。而物理数据流图(physical data flow diagram,简称DFD)正是用于描述系统内部数据流程的工具,它展示了数据的来源、处理过程以及存储位置等信息。因此,正确答案是B。

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