Your company hosts web services in the company intranet. The intranet is secured by a firewall. Devices outside the firewall must be able to access the web services. Company policies prohibit changes to firewall rules. You need to recommend an approach for enabling inbound communication. What should you recommend？（）
- A Use Windows Server AppFabric.
- B Use the Windows Azure AppFabric Service Bus.
- C Use the Windows Azure AppFabric Access Control Service.
- D Use a Windows Communication Foundation （WCF） service in a Windows Azure role that relays to the internal web service