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 While installing a new PCI card the administrator touched the motherboard. While powering on the server, a series of beeps were emitted and the server did not POST. Which of the following could be done to prevent this problem?（）

单项选择题 Whichofthefollowingarchivingmethodsonlybacksupdatathathaschangedsincethepreviousfull backup？（）