单项选择题 The sl：shoppingList and sl：item tags output a shopping list to the response and are used as follows： 11.<sl：shoppingList> 12.<sl：item name="Bread" /> 13.<sl：item name="Milk" /> 14.<sl：item name="Eggs" /> 15.</sl：shoppingList> The tag handler for sl：shoppingList is ShoppingListTag and the tag handler for sl：item is ItemSimpleTag.ShoppingListTag extends BodyTagSupport and ItemSimpleTag extends SimpleTagSupport.Which is true？（）

单项选择题 Given the JSP code： <% request.setAttribute（"foo"， "bar"）； %>and the Classic tag handler code： 5. public int doStartTag（） throws JspException { 6. // insert code here 7. // return int 8. } Assume there are no other "foo" attributes in the web application. Which invocation on the pageContextobject，inserted at line 6，assigns "bar" to the variable x？（）

单项选择题 You are building a web application that will be used throughout the European Union； therefore， it has significant internationalization requirements. You have been tasked to create a custom tag that generates amessage using the java.text.MessageFormat class. The tag will take the resourceKey attribute and a variable number of argument attributes with the format， arg. Here is an example use of this tag and itsoutput：  generates： The disk "MyDisk"contains 1247 file（s）. Which Simple tag class definition accomplishes this goal of handling a variable number of tag attributes？（）