You are developing an application that will use custom authentication and role-based security.

You are developing an application that will use custom authentication and role-based security.
You need to write a code segment to make the runtime assign an unauthenticated principal object
to each running thread.
Which code segment should you use?

A. AppDomain domain =
    AppDomain.CurrentDomain;domain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
B. AppDomain domain = AppDomain.CurrentDomain;domain.SetThreadPrincipal(new     
    WindowsPrincipal(null));
C. AppDomain domain = AppDomain.CurrentDomain;
    domain.SetAppDomainPolicy(
    PolicyLevel.CreateAppDomainLevel());
D. AppDomain domain = AppDomain.CurrentDomain;domain.SetPrincipalPolicy(     
    PrincipalPolicy.UnauthenticatedPrincipal);


Answer: D