Your network consists of a single Active Directory domain. Users access and share documents by using a DFS namespace. You need to recommend a solution to manage user access to documents. The solution must meet the following requirements:

Allow for document versioning
Allow for online collaboration

What should you recommend?

A.
File Server Resource Manager (FSRM)

B.
Volume Shadow Copy Service (VSS)

C.
Microsoft SharePoint Foundation 2010

D.
Windows System Resource Manager (WSRM)

Explanation:
sharepoint allows collaboration and versioning
http://www.plusconsulting.com/WhitePapers/SharePoint%202010%20Business%20Value%20WhitePaper.pdf