A developer is designing a multi-tier web application and discovers a need to hide the details of establishingand maintaining remote communications from the client. In addition， the application needs to find，in a transparent manner，the heterogeneous business components used to service the client’s requests. Which design patterns， working together， address these issues？（）

• A、Business Delegate and Transfer Object
• B、Business Delegate and Service Locator
• C、Front Controller and Business Delegate
• D、Intercepting Filter and Transfer Object