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A developer has created a web application that includes a servlet for each use case in the application.These servlets have become rather difficult to maintain because the request processing methods havebecome very large. There is also common processing code in many servlets because these use cases arevery similar. Which two design patterns can be used together to refactor and simplify this web application？（）

A. Proxy
B. View Helper
C. Front Controller
D. Session Facade
E. Business Delegate
F. Model-View-Controller

应尽可能避免在哪些地方靠近和停留？