Which two about WAR files are true？（）

• A、WAR files must be located in the web application library directory.
• B、WAR files must contain the web application deployment descriptor.
• C、WAR files must be created by using archive tools designed specifically for that purpose.
• D、The web container must serve the content of any META-INF directory located in a WAR file.
• E、The web container must allow access to resources in JARs in the web application library directory.