Your network contains a server named Server1. Server1 has the Streaming Media Services role installed.

You have media files stored on a hard disk drive.

The hard disk drive is formatted by using the NTFS file system and protected by using Encrypted File System (EFS).

You need to ensure that Windows Media Services can open the EFS-encrypted files.

What should you do?

A.
From the Windows Media Services console, configure the WMS NTFS ACL Authorization plug-in.

B.
From the Windows Media Services console, configure the WMS Publishing Points ACL Authorization plug-in.

C.
From the Services console, configure the properties of the Protected Storage service, and then start the service.

D.
From the Services console, configure the properties of the Windows Media Services service, and then restart the service.

Explanation:
Sourcing from an encrypted directory
Security concerns may require that you maintain some or all of your content in an encrypted directory. The encryption process encodes the data in a file so that it is unreadable to a computer or account that does not have the appropriate file encryption key. In the Windows operating system, the file encryption key is assigned to an account. Anyone who logs on using that account is then able to decrypt and use the content.

Windows Media Services can decrypt and stream encrypted content if it is logged on to the proper account. By default, Windows Media Services logs on to the Network Service account. To access the encrypted content, you must set Windows Media Services to log on to the same account that encrypted the content. You can change the account Windows Media Services uses to log on to the computer by using Microsoft Management Console. For more information about encryption, accounts, and user privileges, see Windows Help and Support.

Source: http://technet.microsoft.com/en-us/library/cc754882.aspx