UNIT 4 - PUZZLES 1. How many bidirectional relationships exist in this model? Ans : 3 2. Ans : 3. Ans : 4. Find out the relationships in Class Diagram (Cross Word) Ans : 5. List out the frame operators used in UML sequence diagram. Ans : alt, loop,opt, par, region 6. Find out the notations used in Communication diagram.(word search) Ans : 7. It represents a UML diagram. Ans : Package Diagram 8. State the various layers of Logical architecture. Ans : User interface, Domain, Technical Services Layers.