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What is TRUE about relational database model?

15. What is TRUE about relational database model?

1. Set theory and predicate logic are used in this model.
2. Relational databases were replaced by many other models such as object-oriented models, object-relational models, and others during the era of the relational database.
3. There are two main terms used in a relational database model: instance and schema.
4. All of the above

Answer: D) All of the above

Explanation:

The following statements are TRUE about relational database model:

1. Set theory and predicate logic are used in this model.
2. Relational databases were replaced by many other models such as object-oriented models, object-relational models, and others during the era of the relational database.
3. There are two main terms used in a relational database model: instance and schema.