单项选择题
A.All three files are directly accessible.
B.Only File1.html is directly accessible.
C.Only File2.html is directly accessible.
D.Only File3.html is directly accessible.
E.Only File1.html and File2.html are directly accessible.
单项选择题 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， because the business and resourcetiers are distributed， the application needs to minimize the inter-tier network traffic related to servicing clientrequests. Which design patterns， working together， address these issues？（）
多项选择题 A developer is designing a multi-tier web application and discovers a need to log each incoming clientrequest. Which two patterns， taken independently， provide a solution for this problem？（）
单项选择题 A developer is designing the presentation tier for a web application that relies on a complex session bean.The session bean is still being developed and the APIs for it are NOT finalized. Any changes to the sessionbean API directly impacts the development of the presentation tier. Which design pattern provides a meansto manage the uncertainty in the API？（）