4. As described in the chapter, all of these are normalization "forms" except: a) First normal form b) Second normal form c) Third normal form d) all of these are normal forms 5. The reason why database designers normalize data is: a) To eliminate data errors b) To scale data properly c) To create backup copies of data d) To create efficient database tables 6. A database is in second normal form if it is a first normal form and: a) It contains no data redundancies b) It contains no transitive dependencies c) All data items depend on primary keys d) All of these