フリー問題

問題文

A change must alter members that are already there and must not bring anything new into being. Which function fits that need?

選択肢

1. The change needs a function able to overwrite the present properties inside that stored structure.
2. The change needs a function able to reorder the deepest properties inside that stored structure.
3. The change needs a function able to append the absent properties inside that stored structure.
4. The change needs a function able to cover the varied properties inside that stored structure.