Which of the following is not true about a set of methods that are usefully polymorphic?
This question only considers inheritance-based polymorphism i.e. it does not consider Interfaces.

Question

Which of the following is not true about a set of methods that are usefully polymorphic? 
 This question only considers inheritance-based polymorphism i.e. it does not consider Interfaces.

Answer

If you think all of the above are true, select this option

Answer

Their classes share a common ancestor class from which they are ultimately inherited

Answer

Each should produce a specialised effect appropriate to their class and therefore different to each other

Answer

To be invoked polymorphically, an object of their class's type must be referenced by a variable of an ancestor's type common to all of them

Answer

They must have identical signatures and therefore belong to separate classes

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Which of the following is not true about a set of methods that are usefully poly...

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