Question 1- Multiple choices (7 points 1. The conceptual data model of a database system is a) Software dependent and hardware dependent b) Software dependent and hardware independent c) Software independent and hardware d) Software independent and hardware independent 2. SDL stands for a) Storage Definition Language d) State Description Language 3. The "PreviousJob" attribute of an employee consists of job, company, city, and year. An employee may have more than one previous job if he worked for severcopret ama his professional career. The "PreviousJob" attribute is an exampleofaaribute a) simple b) composite c) multivalued d) derived e) composite multivalued 4. In a specialization lattice, which of the following is true? a) A subclass can have more than one superclass. b) A subclass participates as a subclass in only one class/subclass relationship. c) A subclass does not inherit the attributes and relationships of its superclasses. d) All of the above 5. A weak entity type does not have: a) A partial key b) A primary key c) An identifying relationship type d) None of the above 6. The database state at a specific time is called a) Model b) Catalog c) Intension d) Extension The Delete operation can violate the following constraints: a) Domain constraint b) Entity integrity constraint 7. c) Referential integrity constraint d) None of the above