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Which of the following defines a Meta class?

48. Which of the following defines a Meta class?

1. A Meta class is a class that may not itself have any instances.
2. A Meta class is a class of a class.
3. Meta classes are classes that are different than plain classes.
4. All of the above

Answer: D) All of the above

Explanation:

A Meta class is a class of a class that may not itself have any instances and are different than plain classes.