フリー問題

問題文

The wholesaler needs to point at the row that survived a joining, and it needs one more rule for reporting. Two answers are wanted: at which end of the layout that traces the path the surviving row sits and at which end of the layout that lists matched pairs it sits, and how many of a row's cross-references have to be in use before the settled row counts as in use. Which option states all of it correctly?

選択肢

1. The surviving row sits at the tail of the layout that traces the path and at the head of the layout that lists matched pairs, and the tally of cross-references that must be in use comes to 9.
2. The surviving row sits at the head of the layout that traces the path and at the tail of the layout that lists matched pairs, and the tally of cross-references that must be in use comes to 9.
3. The surviving row sits at the head of the layout that traces the path and at the tail of the layout that lists matched pairs, and the tally of cross-references that must be in use comes to 1.
4. The surviving row sits at the tail of the layout that traces the path and at the head of the layout that lists matched pairs, and the tally of cross-references that must be in use comes to 1.