Final answer:
An entity relationship diagram is not a basic component of a database system; it is a design tool used for data modeling. A database system typically includes a DBMS, database users, and database applications as its core components.
Step-by-step explanation:
The question asks which of the following is not a basic component of a database system: a. Database User, b. Entity relationship diagram, c. DBMS, d. Database application. Among these options, the entity relationship diagram is not a basic component of a database system.
An entity relationship diagram (ERD) is a tool that is used for data modeling to represent the conceptual design of a database. It visually depicts the relationships between entities in a database. However, it is not a component that is part of the database system’s architecture or operation, but rather a blueprint used during the design phase.
Basic components of a database system include the Database Management System (DBMS), which is the software that interacts with end users, applications, and the database itself to capture and analyze the data. Database users are people who use the database through applications or queries. Finally, database applications are the software programs that are specifically designed for interacting with the data in the database, using operations such as creating, retrieving, updating, and deleting data.