(D) DBMS (data base management system) 34. Relational databases is: (B) Data are represented as two-dimensional tables (C) Each table contains data on an entity and its attributes (D) The tables may be referred to as files. (A) All of the above 35. The key field that cannot be duplicated because it is the unique identifier for all the information in any row of the table is the (A) Foreign key (B) Secondary key (C) Primary key (D) None of the above. 36. DBMS have a data definition language to do all of the following EXCEPT: (A) Specify the creation of the database tables (B) Specify the structure of the content of the database (C) Add, change, delete, and retrieve data in the database. (D) Define the characteristics of the fields in each table 37. Data quality audits can be performed by surveying (A) Entire data files (B) Samples from data files (C) End users for their perceptions of data quality (D) All of the above 38. The method of slicing digital messages into parcels, sending them along different communication paths, and then reassembling them after they arrive at their destination is called (A) Data warehousing (B) Packet switching (C) TCP/IP (D) Client-server computing 39. The TCP/IP layer that is responsible for providing the communication and packet services is the (A) Internet layer (B) Transport layer. (C) Application layer (D) Network interface layer 40. What tells the browser software exactly where to look for the information being requested? (A) HTTP (HyperText Transfer Protocol). (B) URL (Uniform Resource Locator) (C) Domain name (D) HTML (Hyper Text Markup Language