1. Class: A class is a blueprint or template that defines the properties (attributes) and behaviors (methods) common to all instances (objects) of the class. \[\] 2. Object: An object is an instance of a class. It represents a specific entity that follows the blueprint defined by the class. \[\] 3. Data: Data refers to information or values stored in memory, and it is not directly related to the concept of behavior or templates. \[\] 4. Polymorphism: Polymorphism refers to the ability of different objects to respond to the same method call in different ways, allowing for flexibility in object-oriented programming. \[\] \[\] Correct Answer: (a)