Of the following Microsoft products, which one should you choose to recommend?

Company Background
Corporate Information
Windaus Press is a private publishing house which publishes books and magazines. There are 250 employees in this company. Windaus Press has four subsidiary companies in North America.
Existing Environment
Existing Licensing Solution
Windaus Press consists of a head office and many branch offices. Windaus Press purchases Licenses for all branch offices under an Open License agreement without Software Assurance. The agreement includes licenses for Microsoft Office Professional 2003, Windows XP Professional Upgrade. The Open License agreement has been out of date.
Business Requirements
Planned Changes
Because of the financial crisis, the company’s profits have fallen. Therefore the company decides to cut down operating costs, the company plans to reduce the staff and the number of desktops and portable computers. Some former employees will work for the company as casual labors after the cost reductions. Since casual labor will also work for other companies, all of them must purchase their own laptops. For the casual labors, the company plans to implement a collaboration solution. This collaboration solution must not require a server. All employees will need a new third-party accounting application. This application requires Office Professional 2007.
Business Goals
Windaus Press aims to achieve the following business goals:
Prevent all casual labors from accessing the company’s internal network
Upgrade Microsoft software to the latest version when available
Implement a collaboration solution for casual labors only
Avoid external financing for licenses and cut down initial licensing costs
Protect the data on laptops owned by the company in case of theft
Select a licensing solution that allows the company to cut down the number of licenses for computers
Question
The company asks you to recommend a collaboration solution for the casual labors. Of the following Microsoft products, which one should you choose to recommend?

A.
Office SharePoint Server 2007

B.
Office SharePoint Server 2007 for Internet sites

C.
Windows SharePoint Services

D.
Office Groove 2007