フリー問題

問題文

An expense system accepted a cost center code of "9999" that is syntactically valid but is not one of the codes in use. The entry landed in an unallocated bucket. Which check was missing?

選択肢

1. A validity check against the list of codes in use, because a format check confirms the shape of the value while a validity check confirms the membership of the permitted set.
2. A limit check against the list of codes in use, because a validity check confirms the shape of the value while a format check confirms the membership of the allowed set.
3. A limit check against the list of codes in use, because a format check confirms the shape of the value while a limit check confirms the ownership of the permitted set.
4. A validity check against the list of codes in use, because a validity check confirms the shape of the value while a validity check confirms the ownership of the allowed set.