You create a Microsoft Windows SharePoint Services site.

You need to ensure that the Web Parts can access the object model of Windows SharePoint Services.

Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A.
Create a custom policy file.

B.
Create a publisher policy file and install it into the global assembly cache (GAC).

C.
Change the trust level for the virtual server so that it references the custom policy file.

D.
Edit the SafeControls section of the web.config file of the virtual server.