单选题 During the systems analysis phase ，you must decide how data will be organized，stored，and managed. A（ ）is a framework for organizing，storing，and managinEach file or table contains data about people，places，things，or events. One of the potential problems existing in a file processing environment is（ ）,which means that data common to two or more information systems is stored in several places.In a DBMS，the linked tables form a unified data structure that greatly improves dataquality and access. A(n)（ ）is a model that shows the logical relationships and interaction among system entities . It provides an overall view of the system and a bluecreating the physical data structures.（ ）is the process of creating table designs by assigning specific fields or attributes to each table in the database. A table designspecifies the fields and identifies the primary key in a particular table or file. The three normal forms constitute a progression in which（ 作答此空）represents the best design. Mbusiness-related databases must be designed in that form.