What will be the output of the following Python code?

class Demo:
    def __init__(self):
        self.a = 1
        self.__b = 1
 
    def display(self):
        return self.__b
obj = Demo()
print(obj.a)

A. To model real-world entities and their interactions B. To maximize efficiency C. To use fewer lines of code D. To create simple programs

A. A specific data type B. A built-in function C. An instance of a class D. A variable in Python

A. A blueprint for creating objects B. A built-in function C. A variable in Python D. A specific data type

A. Polymorphism B. Abstraction C. Inheritance D. Encapsulation