单选题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 bu
题目
单选题
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