1.1) A data model is a collection of conceptual tools for describing data, data relationships, data semantics, and data constraints: a) True b) False 1.2) The three levels of data abstractions provided by a DBMS are a) Users, query processor, storage manager b) Logical design, physical design, indexes c) Logical design, physical design, views d) None of the above 1.3) Johnson wants to store information (names, addresses, descriptions of embarrassing moments, etc.) about his employees. Not surprisingly, the volume of data compels him to buy a database management system. To save money, he wants to buy one with the fewest possible features, and he plans to run it as a stand-alone application on his PC. Of course, Johnson does not plan to share his list with anyone. The following questions (1.3.1)-(1.3.3) are about which DBMS features Johnson should buy. 1.3.1) Johnson should buy the Concurrency Control feature: a) True b) False 1.3.2) Johnson should buy the Query Processing feature: a) True b) False 1.3.3) Johnson should buy the Security feature: a) True b) False