Grading Coece2 points, aw A) Primary Key D) Mini World A) an entity set )An SCHEMA function C) The schema of a relation D) A Hierarchical database 7. The following itetn does not have its own key B) a weak entity set Knowledge D) DBMS 3. The difference between data and informationA) an attribute 8. A key is B) a tuple C) a set of attributes s D) a binary relationship B) there is no difference C) hard to establish D) structural 4. Integrity Constraints are enforced by 9. If (A, B) is a candidate key of R(A, B,C, D A) t A, B, D} is also a candidate key B) A, B must be a primary key C) In any instance of R every tuple has a distinct value of (A, B) A) The Data Base designer B) The DBMS C) The operating System D) The final user D) (A) is a subkey 5. In a relational database, a relation is: A) A set of pairs B) A list of tuples C) A set of tuples A) Prinmary is not an Integrity Constraint B) Domain 10. The following is Integrity D) None of the above C) Merge Rule D) Foreign Key