多项选择题

Which the 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）}
G. ${vals[vals[index-1]]}

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Which the three EL expressions， inserted at line 15， are valid and evaluate to "3"？ （）

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Which the three EL expressions， inserted at line 15， are valid and evaluate to "3"？（）