Given:
11.<%
12.request.setAttribute("vals", new String[]{"1","2","3","4"});
13.request.setAttribute("index", "2");
14.%>
15.<%-- insert code here --%>
Which three EL expressions, inserted at line 15,are valid and evaluate to "3"?()
A.${vals.2}
B.${vals["2"]}
C.${vals.index}
D.${vals[index]}
E.${vals}[index]
F.${vals[vals[index-1]]}