单项选择题
What feature comes into play to help ensure the completion of the backup should one of three backup devices fail during a backup that is using three different channels?（）
A.Channel failover B.Restartable backups C.Rescheduable backups D.Automatic backup recovery E.Channel recovery
单项选择题 Whichdynamicviewdisplaysthestatusofblock-changetracking?（）
单项选择题 Whichofthefollowingmostcloselyrepresentsanimagecopy?（）
单项选择题 Whichbackupoptiondefinesauser-definednameforabackup?（）
