1. The schema and the data in the database are expected to be changed frequently. A. True B. False 2. A candidate key is used to implement relationships between tables. A. True B. False 3. Loosless-join property ensures that any instance of the original relation can be identified from corresponding instances in the smaller relations. A. True B. False 4. The logical data model is built using the information documented in the users' requirements specification. A. True B. False 5. FD is not a property of a relational schema (intension) but a property of a particular instance of the schema (extension). A. True B. False 6. provides description of data to enable program-data independence. A. Data Profile C. All of the above B. Data Catalog D. None of the above 7. Data model components consist of: A. Structural part C. All of the above B. Set of integrity constraint D. None of the above 8. Given the set of functional dependencies, (AB C,D,E and A+ E), for the relation schema R=(A,B,C,D,E) we can infer the following A. A is a key for R C. AR is a key for R B. B.E is a key for R D. None of the above 9. If two data objects, A and B, are related in a one-to-many relationship, then: A. Every A can be related to C. Either A or B one or more Bs D. None of the above B. Every B can be related to one or more As 10. The "registers" relationship in: "A staff registers customers at a branch in a team" is a relationship A. Unary C. Ternary B. Binary D. Quaternary