Which two about WAR files are true？（）
- AWAR files must be located in the web application library directory.
- BWAR files must contain the web application deployment descriptor.
- CWAR files must be created by using archive tools designed specifically for that purpose.
- DThe web container must serve the content of any META-INF directory located in a WAR file.
- EThe web container must allow access to resources in JARs in the web application library directory.