Real Estate brokers have a database of "unique" inventory; each property is one of a kind. If the properties are removed from the property inventory when sold then the field "quantity on hand" for each inventory record will not be necessary in this database because: a. this information is meaningless. b. it can always be calculated from other fields. c. quantity on hand is always one. d. including that field would reduce the database normalization from 3NF to 2NF. e. none of the above QUESTION 6 Probably the most serious disadvantage of relational databases (as opposed to object- oriented databases) is that: a. they do not support complex data types such as graphics, sound, and video b. they are less efficient than other types of data bases c. they require more memory and storage space d. they cannot handle tabular data well QUESTION 7 Advantages of object-oriented databases include all of the following except: a. representations of graphic or spatial relationships b. reusability of object code c. greater flexibility to do ad hoc queries d. ability to handle complex data types QUESTION 8 Considering the proper segregation of duties in building and maintaining databases, access to the data definition language (DDL) and the data manipulation language (DML) in a database environment should be available to whom? a. every database user b. the database administrators (DBAs) and programmers c. the computer operators d. only database users who must enter transactions in the system