Many people view the four foundational elements of object-orientation as abstraction, encapsulation, inheritance, and polymorphism. There is a certain purity in being minimal. Various language designers have emphasized these four elements differently. In some object-oriented languages these four have been minimized to three. Of these four, if you could de-emphasize one, i.e. you felt it was essential to what object-orientation is all about, which would it be? And why? Justify your line of reasoning.
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This solution talks about the key element of abstraction in Object Oriented systems. The explanation includes analogies of abstraction and how it's importance leads to better system development.