多选题Which three web application deployment descriptor elements allow web components to gain references toresources or EJB components？（）Aejb-refBjdbc-refCservlet-refDresource-refEjavamail-refFresource-env-ref
多选题
Which three web application deployment descriptor elements allow web components to gain references toresources or EJB components？（）
A
ejb-ref
B
jdbc-ref
C
servlet-ref
D
resource-ref
E
javamail-ref
F
resource-env-ref
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