单项选择题 WhichischaracteristicoftheBusinessDelegatepattern？（）

单项选择题 Company.com has decided to use the FUBAR Application Server to host their web application. Unfortunately， the FUBAR Application Server uses the server machine’s file system for its JNDI namespace. Every JNDI lookup performed in the web application is translated into a file 1/0 operation， which results in very poor performance.  Which J2EE pattern can help with this performance issue？（）

单项选择题 A Company.com developer is designing a multi-tier web application and discovers a need to hide the details of establishing and maintaining remote communications from the client. In addition， because the business and resource tiers are distributed， the application needs to minimize the inter-tier network traffic related to servicing client requests.  Which design patterns， working together， address these issues？（）