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Finally Ans Is here. In object-oriented programming languages with multiple inheritance and knowledge organization, the diamond problem is an ambiguity that arises when two classes B and C inherit from A, and class D inherits from both B and C. If a method in D calls a method defined in A (and does not overridethe method), and B and C have overridden that method differently, then from which class does it inherit: B, or C? For example, in the context of GUI software development, a class Button may inherit from both classes Rectangle (for appearance) andClickable (for functionality/input handling), and classes Rectangle and Clickable both inherit from the Object class. Now if the equalsmethod is called for a Button object and there is no such method in the Button class but there is an overridden equals method in bothRectangle and Clickable, which method should be eventually called? It is called the "diamond problem" because of the shape of the class inheritance diagram in this situation. In this article, class A is at the top, both B and C separately beneath it, and D joins the two together at the bottom to form a diamond shape.