单项选择题
A. System image
B. Incremental backup
C. System state restore
D. Differential backup
单项选择题 WhichofthefollowingRAIDlevelswouldbeappropriategiventwodrivesandaneedforfault tolerance？（）
单项选择题 Givenfourdrives，whichofthefollowingRAIDlevelswillallowfortheGREATESTperformance？（）
单项选择题 An administrator needs to add fault tolerance capabilities to a server. Which of the following is the BEST solution to accomplish this?（）