How can you define a method in an object in Python?

A method in an object in Python is defined within a class using the def keyword. This approach allows you to encapsulate functionality that is associated with the object, ensuring that the method can access and manipulate the object's attributes—essentially becoming part of the object's behavior.

When a method is defined this way, it becomes a callable function that can be executed on an instance of the class. By using def within the class definition, you're indicating that this function is tied to the class itself and its instances, distinguishing it from regular functions that might exist independently in the module.

The correct answer highlights the fundamental OOP (Object-Oriented Programming) approach in Python, where classes serve as blueprints for creating objects, and methods define the actions these objects can perform, leveraging both encapsulation and reusability.