Which type of backup contains only the blocks that have changed since the last level 0 incremental backup?（）A、a cumulative level 1 backupB、a differential level 1 backupC、a full backupD、a whole backup
题目
Which type of backup contains only the blocks that have changed since the last level 0 incremental backup?（）
- A、a cumulative level 1 backup
- B、a differential level 1 backup
- C、a full backup
- D、a whole backup