フリー問題

問題文

A designer wants code outside one class declaration to be unable to build instances of it. Which pair of steps do these rules describe?

選択肢

1. Weighed among the designs that this chapter describes for such a wish, the design described is a declaring with one throwing, because these requirements let such a sealing plot one throwing beside that declaring
2. Weighed among the designs that this chapter describes for such a wish, the design described is a declaring with one privacy, because these requirements let such a sealing level one privacy beside that declaring
3. Weighed among the designs that this chapter describes for such a wish, the design described is a declaring with one sealing, because these requirements let such a sealing tag one sealing beside that declaring
4. Weighed among the designs that this chapter describes for such a wish, the design described is a declaring with one erasure, because these requirements let such a sealing publish one erasure beside that declaring