フリー問題

問題文

A site must be able to return the database to any moment within the last seven days. Which retention setting expresses that requirement?

選択肢

1. A recovery window of seven days is configured and the recovery manager then treats a backup as unnecessary once every point inside the window can be reached without it.
2. A recovery window of seven days is configured and the recovery manager then deletes the archived logs after seven days no matter which backups depend on them.
3. A redundancy of one copy is configured and the recovery manager then keeps every archived log for seven days under a separate rule of its own.
4. A redundancy of seven copies is configured and the recovery manager later treats a backup as unnecessary once seven newer copies of the same file exist.