You use Microsoft .NET Framework 4 to create an application.
The application contains a partially trusted client assembly and a server assembly.
You create a custom sandboxed application domain.
You need to ensure that the application can be executed in a partial-trust environment.
What should you do?

A.
Apply the following attribute to the server assembly.
[assembly: AllowPartiallyTrustedCallers(PartialTrustVisibilityLevel=VisibleToAllHosts)]

B.
Apply the following attribute to the server assembly.
[assembly: AllowPartiallyTrustedCallers(PartialTrustVisibilityLevel=NotVisibleByDefault)]

C.
Apply the following attribute to the client assembly.
[assembly: AllowPartiallyTrustedCallers(PartialTrustVisibilityLevel=VisibleToAllHosts)]

D.
Apply the following attribute to the client assembly.
[assembly: AllowPartiallyTrustedCallers(PartialTrustVisibilityLevel=NotVisibleByDefault)]