单项选择题
Which of the following most closely represents an image copy? （）
A.Unix cp command of a file B.Bit-by-bit copy of a file C.Windows COPY command of a file D.All of the above
单项选择题 Whichbackupoptiondefinesauser-definednameforabackup?（）
单项选择题 Whichtypeofbackupbacksuponlydatablocksmodifiedsincethemostrecentbackupatthesamelevelorlower?（）
单项选择题 Whichofthefollowingbestdescribesafullbackup?（）
