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Answer A is correct. Ruby should restart the server in Directory Services Restore Mode and use the NTDSUtil utility to move the file. To move this file, she must use this utility to ensure that the appropriate Registry settings are also modified.
This file cannot be moved while it is in use. Answer B is incorrect because using Windows Explorer to move the file will not allow the Registry to be automatically modified. Answer C is incorrect because Ruby cannot move the file while it’s in use. Also, this method will not automatically modify the Registry. Answer D is incorrect because, again, Ruby cannot move the file while it’s in use.