Which three statements are true about JAX-WS Web services?

Which three statements are true about JAX-WS Web services? (Choose three.)
A. EJB-based endpoints are always invoked one thread at a time.
B. Servlet-based endpoints are always invoked one thread at a time.
C. EJB-based endpoints can be invoked by multiple threads at the same time.
D. Servlet-based endpoints can be invoked by multiple threads at the same time.
E. Java SE 6 is suitable for development of a Web service endpoint interface.

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