Explain briefly object modeling , dynamic modeling and functional modeling with the help of suitable diagrams.

Object-Oriented Analysis and Design (OOAD) is a methodology that uses object-oriented techniques to analyze and design a system. In OOAD, three major models are used to represent different aspects of the system: object modeling, dynamic modeling, and functional modeling. Each model focuses on a different view of the system.

Object Modeling:  
Object modeling represents the static structure of the system. It focuses on the objects in the system, their attributes, operations (methods), and relationships among them. The primary tool for object modeling is the Class Diagram. It shows classes (blueprints of objects), their attributes, methods, and the associations between different classes.

For example, in a Library Management System:

- Class Diagram:

```
+-----------------+        +----------------+         +------------------+
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