单项选择题
Servlet A receives a request that it forwards to servlet B within another web application in the same web container. Servlet A needs to share data with servlet B and that data must not be visible to other servlets in A’s web application. In which object can the data that A shares with B be stored？（）
A. HttpSession B. ServletConfig C. ServletContext D. HttpServletRequest E. HttpServletResponse
多项选择题 Forwhichthreeeventscanwebapplicationeventlistenersberegistered？（）
多项选择题 AdeveloperchoosestoavoidusingSingleThreadModelbutwantstoensurethatdataisupdatedinathread-safemanner.Whichtwocansupportthisdesigngoal？（）
多项选择题 ARequestDispatchercanbeobtainedfromwhichtwoobjects？（）
