What is the purpose of the final keyword in C++?

Correct option is A

The final keyword in C++ is used to restrict inheritance or method overriding. When applied to a class, it prevents the class from being inherited. When applied to a method, it prevents the method from being overridden in derived classes.
Important Key Points:
1. Class-level restriction: Declaring a class as final ensures that no other class can inherit from it. Example:
class Base final {};
2. Method-level restriction: Declaring a method as final ensures it cannot be overridden in a derived class. Example:

3. This is primarily used to enforce stricter design constraints and avoid unintended modifications through inheritance.
Knowledge Booster:
· To declare a variable as constant: Use the const keyword, not final. Example: const int a = 10;
· To allocate memory dynamically: Use the new keyword, not final. Example: int* p = new int;
· To define a destructor: Use ~ClassName(), not final. Example:
class Base { ~Base() {}; };
· To make a method virtual: Use the virtual keyword. Example: virtual void display();