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A collection of tables to represent both data and the relationships among data, is known as

1. Entity relationship model
2. Relational Model
3. Object-based Data model
4. Semi structured data model

To represent data in the database, and the need of efficiency has led designers to use

1. Optimized data structure
2. No data structure
3. Simple data structure
4. Complex data Structure

Record-based models are so named because the database is structured in

1. Variable-format records
2. Random-format records
3. Fixed format records
4. None of the above

The Data model that is widely used in the database design is

1. Object-based Data model
2. Relational Model
3. Semi-structured data model
4. Entity relationship model

The entity-relationship model is widely used in

1. Database design
2. Database processing
3. Database implementation
4. Database direction