e) Explain the open-closed principle. Also, look at the following class diagram, where the class Client...

   

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e) Explain the open-closed principle. Also, look at the following class diagram, where the class Client calculates the area of a Rectangle. A new class Triangle should be added to the application. Apply the open-closed principle and modify the class diagram, for the Client to be able to work with both Rectangle and Triangle. Rectangle +area(): double Client +calculateArea(shape: Rectangle) e) Explain the open-closed principle. Also, look at the following class diagram, where the class Client calculates the area of a Rectangle. A new class Triangle should be added to the application. Apply the open-closed principle and modify the class diagram, for the Client to be able to work with both Rectangle and Triangle. Rectangle +area(): double Client +calculateArea(shape: Rectangle)