单项选择题
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
C. helps to reduce tape, file management and archive costs
D. helps to control the write speed matching on LTO-4 drives
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A. 1Gbps+
B. 2Gbps+
C. 4Gbps+
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A customer is currently using EMC disk. They are having an issue with the time it takes to complete a backup. What IBM tool can be used to show how much improvement can occur in the time it takes to backup the disk?（）
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