单项选择题 In a JSP-centric web application， you need to create a catalog browsing JSP page. The catalog is stored asa List object in the catalog attribute of the webapp’s ServletContext object.  Which scriptlet code snippetgives you access to the catalog object？（）

单项选择题 For manageability purposes， you have been told to add a "count" instance variable to a critical JSP Document so that a JMX MBean can track how frequent this JSP is being invoked. Which JSP code snippetmust you use to declare this instance variable in the JSP Document？（）

单项选择题 For debugging purposes， you need to record how many times a given JSP is invoked before the user’ssession has been created. The JSP’s destroy method stores this information to a database. Which JSPcode snippet keeps track of this count for the lifetime of the JSP page？（）