You create an ASP.NET application by using Microsoft Visual Studio .NET 2008 and the .NET Framework 3.5.
The application will be deployed to a Microsoft Windows Server 2008 server.
Intranet users will access the application by using Windows Vista client computers.
The Web server, client computers, and Windows user accounts are located in the same Active Directory.
You need to identify an appropriate authentication mechanism that meets the following requirements:
– Supports security impersonation and delegation.
– Avoids passing user credentials as clear text.
Which authentication mechanism should you use?

A.
NTLM

B.
Basic

C.
Digest

D.
Kerberos