单项选择题 You have created a servlet that generates weather maps. The data for these maps is calculated by aremote host. The IP address of this host is usually stable， but occasionally does have to change as thecorporate network grows and changes. This IP address used to be hard coded， but after the fifth change tothe IP address in two years， you have decided that this value should be declared in the deploymentdescriptor so you do NOT have the recompile the web application every time the IP address changes. Which deployment descriptor snippet accomplishes this goal？（）

单项选择题 Given a portion of a valid Java EE web application’s directory structure： MyApp | |-- File1.html | |-- Directory1 ||-- File2.html| |-- META-INF |-- File3.html You want to know whether File1.html， File2.html， and/or File3.html will be directly accessible by your webclient’s browsers. Which statement is true？（）

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？（）