フリー問題

問題文

Which pair decides between publishing an interface with default methods and an abstract base?

選択肢

1. Choosing the interface admits joint supertypes, and the abstract alternative separately supplies stored fields for subclasses.
2. Choosing the interface admits exclusive supertypes, and the abstract alternative separately supplies stored fields for subclasses.
3. Choosing the interface admits exclusive supertypes, and the abstract alternative separately supplies immutable fields for subclasses.
4. Choosing the interface admits joint supertypes, and the abstract alternative separately supplies immutable fields for subclasses.