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單項選擇題

A customer wants to create backups at a remotely located datacenter.  Price and performance are of primary importance， so backup to disks at the remote location is selected instead of tape.  The remote location is 1 KM （0.6 Miles） away from the data center.  NAS is the solution being considered.  Which of the following is the benefit of this solution？（）

A.NAS runs on 2Gb fibre， which will provide better performance.
B.NAS uses WAN infrastructure， which can easily span the 1 KM gap.
C.NAS requires fibre storage， which allows dual paths for redundancy.
D.NAS requires iSCSI routers and offers better growth environment.

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