One tool that is useful during both analysis and design is the （）,which is a pictorial representation of the items of information(entities) within the system and the relationships between these pieces of information.

A.data dictionary

B.dataflow diagram

C.use case diagram

D.entity-relation ship diagram

测试程序在AMM哪个页区？

A、1-99

B、201-299

C、501-599

D、601-699