1. What is the primary purpose of a database management system (DBMS)? a) To design websites b) To store, retrieve, and manage data in databases c) To create spreadsheets d) To write code for applications 2. Which of the following is a feature of the relational database model? a) Data is stored in hierarchical structures b) Data is stored in a flat file c) Data is stored in tables with rows and columns d) Data is stored in a single block 3. Which SQL statement is used to retrieve data from a database? a) INSERT b) DELETE c) SELECT d) UPDATE 4. In a relational database, what is a primary key? a) A unique identifier for each record in a table b) A field that can contain duplicate values c) A field used to store large binary data d) A field that indexes the table 5. What is the purpose of normalization in a database? a) To create duplicate records b) To reduce data redundancy and improve data integrity c) To speed up data retrieval d) To create complex queries