フリー問題

問題文

A class keeps a field private and lets other classes read its value through a method that only returns it. Which role does that method play?

選択肢

1. The reading method automatically works as one launcher method for the private field.
2. The reading method automatically works as one accessor operation for the private field.
3. The reading method automatically works as one mutator member for the private field.
4. The reading method automatically works as one constructor routine for the private field.