フリー問題

問題文

For the strictest case the snapshot has to be taken while the application is not writing. The rule that runs before the snapshot has to reach into the right place, and the result has to be usable. Which pair states what the rule targets and what the copy keeps?

選択肢

1. The copy has to be taken while writes are held, so the earlier rule targets the named database and the taken copy keeps the whole integrity in that specification.
2. The copy has to be taken while writes are held, so the earlier rule targets the named database and the taken copy keeps the whole equivalence in that specification.
3. The copy has to be taken while writes are held, so the earlier rule targets the named requester and the taken copy keeps the whole integrity in that specification.
4. The copy has to be taken while writes are held, so the earlier rule targets the named requester and the taken copy keeps the whole equivalence in that specification.