You create Microsoft Windows-based applications. You are creating a sales management application that accesses data from a Microsoft SQL Server 2005 database. The application uses Microsoft Windows Authentication Mode to access SQL Server 2005. After testing, the design team moves the database from the test server to the production server. The design team modifies the connection string on the application. You test the new configuration on your computer and the application runs successfully. You deploy the application to five client computers. The five client computers use other applications on the network that access different databases on the production server by using Windows Authentication Mode. You evaluate the application design and the production configuration. You conclude that the application will not connect to the database. What is the most likely cause of the problem?

A.
Users do not have valid logons for SQL Server.

B.
Users do not have the correct permissions for the sales database.

C.
Client computers are not configured correctly to use the network.

D.
The database server is not configured correctly to use the network.