Which of the following class cannot exist standalone in an object model?

Question: Which of the following class cannot exist standalone in an object model?

I'm not sure which classes you are referring to. Could you please provide more context or information? 

If you are asking about the types of classes that cannot exist independently in an object model, it is likely that you are referring to abstract classes. Abstract classes are classes that cannot be instantiated on their own and must be subclassed to be used. 

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