Question: The constraint or in specialisation / generalisation means that A . there could be some elements belonging to two or more subclasses B . there

The constraint or in specialisation/generalisation means that
A.
there could be some elements belonging to two or more subclasses
B.
there are some elements in the subclasses but not in the super class
C.
there is no element belonging to two different subclasses
D.
there is no element in the subclasses but not in the super class

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