Which the two are true regarding a web application class loader？（）

• A、 A web application may override the web container’s implementation classes
• B、 A web application running in a J2EE product may override classes in the javax.* namespace
• C、 A web application class loader may NOT override any classes in the java.* and javax.*  namespace
• D、 Resources in the WAR class directory or in any of the JAR files within the library directory may  be accessed using the J2SE semantics of getResource
• E、 Resources in the WAR class directory or in any of the JAR files within the library directory  cannot be accessed using the J2SE semantics of getResource