You are writing code for user authentication and authorization.

You are writing code for user authentication and authorization. The username, password, and
roles are stored in your application data store.
You need to establish a user security context that will be used for authorization checks such as
IsInRole. You write the following code segment to authorize the user.
if (!TestPassword(userName, password))
throw new Exception(“could not authenticate user”);String[] userRolesArray =
LookupUserRoles(userName); You need to complete this code so that it establishes the
user security context. Which code segment should you use?

A. GenericIdentity ident = new GenericIdentity(userName);GenericPrincipal currentUser = new
GenericPrincipal(ident, userRolesArray);Thread.CurrentPrincipal = currentUser;
B. WindowsIdentity ident = new WindowsIdentity(userName);WindowsPrincipal currentUser =
new WindowsPrincipal(ident);Thread.CurrentPrincipal = currentUser;
C. NTAccount userNTName = new NTAccount(userName);GenericIdentity ident = new
GenericIdentity(userNTName.Value);GenericPrincipal currentUser= new
GenericPrincipal(ident, userRolesArray);Thread.CurrentPrincipal = currentUser;
D. IntPtr token = IntPtr.Zero;token = LogonUserUsingInterop(username,
encryptedPassword);WindowsImpersonationContext ctx =
WindowsIdentity.Impersonate(token);

Answer: A