Which code segment should you use?

You are developing an application that will deploy by using ClickOnce. You need to test if the application executes properly. You need to write a method that returns the object, which prompts the user to install a ClickOnce application. Which code segment should you use?

A.
return ApplicationSecurityManager.ApplicationTrustManager;

B.
return AppDomain.CurrentDomain.ApplicationTrust;

C.
return new HostSecurityManager();

D.
return SecurityManager.PolicyHierarchy();