Question: When is a method abstract ? When it is constant throughout the inheritance hierarchy When its definition changes in the inheritance hierarchy, but there is

When is a method abstract?
When it is constant throughout the inheritance hierarchy
When its definition changes in the inheritance hierarchy, but there is a reasonable default implementation
None of the above
Always
When no reasonable default implementation can be provided, and it must be defined in the inheritance hierarchy
When is a method abstract? When it is constant throughout the

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