Given:11.<%12.request.setAttribute("vals",newString[]{"1","2&q

Given：11.<%12.request.setAttribute（"vals"，newString[]{"1"，"2"，"3"，"4"}）；13.request.setAttribute（"index"，"2"）；14.%>15.<%--insertcodehere--%>WhichthreeELexpressions，insertedatline15，arevalidandevaluateto"3"？（）

A.${vals.2}

B.${vals["2"]}

C.${vals.index}

D.${vals[index]}

E.${vals}[index]

F.${vals[vals[index-1]]}