Question: When is constant throughout the air face reasonable? When is a method abstract ? When it is constant throughout the inheritance hierarchy When no reasonable

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

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