フリー問題

問題文

One constructor of a class must run the work of another constructor of the same class before doing its own work. Which kind of call does that?

選択肢

1. The first line consistently makes an unassigned invocation of the same class.
2. The first line consistently makes an unrelated invocation of the same class.
3. The first line consistently makes an internal invocation of the same class.
4. The first line consistently makes an upward invocation of the same class.