You create a Web Service by using Microsoft Visual Studio .NET 2008 and the .NET Framework 3.5.
The Web service will retrieve data from text files in a network share. The network share uses the NTFS file system permissions.
You need to design a component that allows users to access only the files for which they have the necessary permission.
What should you do?

A.
Enable Windows Authentication in Microsoft Internet Information Services. Use impersonation to access the files.

B.
Enable Windows Authentication in Microsoft Internet Information Services. Configure IIS to use Secure Sockets Layer (SSL).

C.
Use a custom header to authenticate the user. Impersonate the user by using a CustomIdentity object to access the files.

D.
Use a custom header to authenticate the user. Impersonate the user by using a WindowsIdentity object to access the files.