单项选择题 Which of the following is the MOST likely reason that a feature is not available in a virtualized environment?（）

单项选择题 A full backup is performed every Sunday and incremental backups are performed daily Monday through Saturday. How many tapes would be required to perform a full restore if a complete failure occurred on Thursday before the incremental backup?（）

单项选择题 WhichofthefollowingistheMOSTsecureandefficientwaytodisposeofrewritableDVDmedia containingsensitiveinformation？（）