You are designing a service that will use the Windows Azure AppFabric Service Bus.  You need to recommend an approach for controlling access to the service by using the Windows Azure AppFabric Access Control Service. Which two actions should you recommend？（）

• A、 Configure the service to not require authentication.
• B、 Configure the service to require a relay access token.
• C、 Specify message security for all communications between clients and the service.
• D、 Specify transport security for allcommunications between clients and the service.