You need to successfully configure file history

You are a system administrator for a local accounting firm. Your company uses Windows 8.1 Pro desktop
computers. All computers have a secondary D: drive.
You want to enable File History for all your users. You create the folder structure D:\Backup\File History on all
user computers. You launch the File History application and verify that it is turned on. Next, you click Select
drive in Configure File History Settings. However, under Copy Files to: you get the message, “No usable drives
were found.”
You need to successfully configure file history.
What should you do?

A.
Share the File History folder.

B.
Grant NTFS rights to the File History folder.

C.
Use a network drive for file history.

D.
Verify that your local drive has enough free space.

Explanation:
http://windows.microsoft.com/en-us/windows-8/set-drive-file-history
Set up a drive for File History
Before you start using File History to back up your files, you need to first select where your backups are saved.
You can select an externally connected drive, such as a USB drive, or you can save to a drive on a network.
There are other choices, but these two provide the best options to help protect your files against a crash or
other PC problems.