Explanation: The single application may have several different versions of this layer, corresponding to distinct kinds of interfaces such as Web browsers, and user interfaces of mobile phones, which have much smaller screens. 6. The ______________ layer, which provides the interface between the business-logic layer and the underlying database.
A. Business logic
B. Presentation
C. User interaction
D. Data access
Answer:A
Explanation: The single application may have several different versions of this layer, corresponding to distinct kinds of interfaces such as Web browsers, and user interfaces of mobile phones, which have much smaller screens. 6. The ______________ layer, which provides the interface between the business-logic layer and the underlying database.
A. Business logic B. Presentation C. User interaction D. Data access
Explanation: Many applications use an object-oriented language to code the business-logic layer, and use an object-oriented model of data, while the underlying database is a relational database. 7. The _____________ system is widely used for mapping from Java objects to relations.