单项选择题
AbankingcustomerisconfusedaboutRAIDprotection.WhichofthefollowingarecharacteristicofRAID－6？（）
A.Doubledrivefailureinanarrayandextremelyhighdatafaulttolerance
B.DoubledrivefailureinanarrayandmoretotalstoragecapacitythanRAID-5
C.ExtremelyhighdatafaulttoleranceandhigherperformancethanRAID-5
D.HigherperformancethanRAID-5andmoretotalstoragecapacitythanRAID-5