Which two authentication mechanisms provide weaker protection than other mechanisms？（）

多项选择题Whichthreeareguaranteedtobevalidfortheelementofawebapplicationdeploymentdescriptor？（）

A. FORM
B. DIGEST
C. NORMAL
D. ENCRYPTED
E. CLIENT-CERT

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]]}

单项选择题GivenaJSPerrorpage，whichimplicitobjectreferstotheuncaughtThrowablethatresultedinthepagebeinginvoked？（）

A. Error
B. Exception
C. Throwable
D. Request error
E. Request exception

多项选择题Which two are true？（）

A. The function method must have the signaturepublic： String spin（）.
B. The method must be mapped to the logical name “spin” in the web.xml file.
C. The function method must have the signature：public String spinIt（）.
D. The function method must have the signature：public static String spin（）.
E. The function method must have the signature：public static String spinIT（）.
F. The function class must be named Spinner， and must be in the package com.example.

多项选择题GivenawebapplicationinwhichtherequestparameterproductIDcontainsaproductidentifier.WhichtwoELexpressionsevaluatethevalueoftheproductID？（）

A. ${product ID}
B. ${param.productID}
C. ${params.productID}
D. ${params.productID[1]}
E. ${paramvalues.productID}
F. ${paramValues.productID[0]}
G. ${pageContext.request.productID}