フリー問題

問題文

A partner reads the identifiers it receives, splits them on the second dash, and builds its own from the halves. Two months later the inner numbering changes and every one of its calls fails. Two rules would have prevented that. Which pair prevents it?

選択肢

1. The interface requirement notes its supplied key and cites the closed format throughout the set.
2. The interface requirement notes its supplied key and cites the prefixed format throughout the set.
3. The interface requirement notes its sequenced key and cites the prefixed format throughout the set.
4. The interface requirement notes its sequenced key and cites the closed format throughout the set.