Where are the data components of a class that differ for each object stored?

The answer is instance variable. Each object in data components of a class differ and are stored in instance variable. Moreover, when an object is instantiated, it means that for each instantiated object of the class, there is a separate copy or instance.

The answer is Instance Variables. The data components of a class that differ for each object stored is Instance Variables. An instance variable has a name beginning with @, and its scope is confined to whatever object self refers to. They are called so because their values are instance specific and are not shared among instances.