Which two IBM WebSphere Application Server components should administrators consider when planning for a high availability environment? (Choose two.)

Which two IBM WebSphere Application Server components should administrators consider when planning for a high availability environment? (Choose two.)
A . User registries
B . Messaging engines
C . Caching proxy servers
D . Back-end servers, such as database, enterprise information systems, etc.
E . Containers, such as the web, Enterprise JavaBeans (EJB), and Session Initiation Protocol (SIP)

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Answer: B,E