单项选择题

All of the following RAID levels are available on an IBM System Storage DS8700 and DS8800 with the exception of:（）

A.RAID 1
B.RAID 5
C.RAID 6
D.RAID 10

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Which of the following is a benefit of the IBM Long Term File System (LTFS)? （）

A. management of the library files
B. management of the encryption keys and archives
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