Which two are characteristics of the Intercepting Filter pattern？（）

• A、 it provides centralized request handling for incoming requests.
• B、 It forces resource authentication to be distributed across web components.
• C、 It reduces coupling between presentation-tier clients and underlying business services.
• D、 It can be added and removed unobtrusively， without requiring changes to existing  code.
• E、 It allows preprocessing and postprocessing on the incoming requests and outgoing  responses.