Which line of code should you use?

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The configuration file contains the following code segment.

<configuration>
<connectionStrings>
<add name=”AdventureWorksLT”
connectionString=”DataSource=SQL01;InitialCatalog=AdventureWorksLT;IntegratedSecurity=True;”
providerName=”System.Data.SqlClient”/>
</connectionStrings>
</configuration>

You need to retrieve the connection string named AdventureWorksLT from the configuration file. Which line of code should you use?

A.
varconnectionString=ConfigurationManager.ConnectionStrings[“AdventureWorksLT”].ConnectionString;

B.
varconnectionString=ConfigurationManager.ConnectionStrings[“AdventureWorksLT”].Name;

C.
varconnectionString=ConfigurationManager.AppSettings[“AdventureWorksLT”];

D.
varconnectionString=ConfigurationSettings.AppSettings[“AdventureWorksLT”];