【单项选择题】
You need to protect the confidential data files on File2 against unauthorized offline access.  <br /> What should you use？（）<p> You need to protect the confidential data files on File2 against unauthorized offline access.  <br /> What should you use？（）</p>
A、A.Encrypting File System （EFS） on File2
B、B.file screens on Node1 and Node2
C、C.NTFS permissions on File2
D、D.Windows BitLocker Drive Encryption （BitLocker） on Node1 and Node2
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