Which 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.* namespaces.
• 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.