Your company uses Public folders and Web Distributed Authoring and Versioning.
The company asks you to install Microsoft Windows SharePoint Services (WSS) as a server in a new server farm.
You plan to install WSS on a server that runs Windows Server 2008 R2.
You start the Configuration Wizard to begin the installation.
You receive an error message as shown in the exhibit.

You need to configure WSS to start SharePoint Services 3.0 SP 2 Central Administration.

What should you do?

A.
Install the Windows Internal Database.

B.
Install a Microsoft SQL Server 2005 server.

C.
Install the Active Directory Rights Management Services server role.

D.
Install the Active Directory Lightweight Directory Services server role.

Explanation:
Software requirements
The Windows SharePoint Services 3.0 installation and configuration wizard marshals many components. If you uninstall Windows SharePoint Services 3.0, and then later install Windows SharePoint Services 3.0 on the same computer, the Setup program could fail when creating the configuration database, which would cause the entire installation process to fail. You can prevent this failure by deleting the existing configuration database or by using the psconfig command to create a new configuration database.

Database
When you perform a Basic installation, Windows Internal Database is automatically installed. When you perform an Advanced installation on a stand-alone computer that already has Microsoft SQL Server installed, ensure that the computer meets the hardware and software requirements for a database server.

Source: http://technet.microsoft.com/en-us/library/cc288751.aspx