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D. an instance variable
In object-oriented programming, a variable that is stored separately in every object of a class is called an instance variable. An instance variable is associated with a specific instance of a class, and its value is unique to that instance. This means that if you have two objects of the same class, each object can have its own unique value for an instance variable.
A Python class variable is shared by all object instances of a class. Class variables are declared when a class is being constructed. They are not defined inside any methods of a class. Because a class variable is shared by instances of a class, the Python class owns the variable.
B IS CORRECT
Wondering, if Class Variable (B) is the right answer? Its "...A variable stored separately in every Object...", could mean a variable X in class definition, accessed by object O1, O2...On for their own copies.
Even so, python.org sayeth: "...instance variables are for data unique to each instance and class variables..." https://docs.python.org/3/tutorial/classes.html
So with Python.org's definition of "instance variable" in mind, D is correct. The "just references to objects" thing is, I think, a little beyond the scope of the PCAP exam...?
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