フリー問題

問題文

A buyer is turned away and cannot tell whether its identity material failed or whether it simply sent too much traffic. Which property must that turning away have?

選択肢

1. Refusals must carry the timing hint plainly, so the caller takes the hurried move after that point.
2. Refusals must carry the timing hint plainly, so the caller takes the right move after that point.
3. Refusals must carry the cause hint plainly, so the caller takes the hurried move after that point.
4. Refusals must carry the cause hint plainly, so the caller takes the right move after that point.