【单选题】
You are designing a Windows Azure web application.  <br /> The application must integrate with on-premise business services.  <br /> The business services are running on an on-premise server and cannot be rewritten. The business services are not exposed externally.  <br /> You need to recommend an approach for accessing the business services. <br /> What should you recommend？（）  
A、 Move business service functionality to Windows Azure.
B、 Connect to the on-premise server from a custom service in Windows Azure.
C、 Create a VPN connection between the application and the on-premise server.
D、 Expose the business services to the Windows Azure AppFabricService Bus by using a custom service that configures relay binding.
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