The correct answer is True.
A class D can be derived from a class C, which is derived from a class B, which is derived from a class A. This is because inheritance is a relationship between classes in which one class (the derived class) is based on another class (the base class). The derived class inherits the members of the base class, and can add its own members.
In this case, class D inherits from class C, which inherits from class B, which inherits from class A. This means that class D has all of the members of class C, class B, and class A. It can also add its own members.
For example, let’s say we have a class called Animal with the following members:
class Animal {
public string name;
public int age;
}
We can then create a derived class called Dog that inherits from Animal:
class Dog : Animal {
public string breed;
}
A Dog object will have all of the members of an Animal object, plus the additional member breed.
Inheritance is a powerful tool that can be used to create reusable code. It can also be used to model real-world relationships between objects.