Question: The constraint optional in specialisation / generalisation means that A . Some member of the subclass can be not in the super class B .

The constraint optional in specialisation/generalisation means that
A.
Some member of the subclass can be not in the super class
B.
Any member of the subclass has to be a member of the super class
C.
Every member of the super class has to be a member of subclasses
D.
Some member of the super class can be not in any subclasses

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