[单项选择题]Assume the tag handler for a st：simpletag extends SimpleTagSupport. In what way can scriptlet code be used in the body of st：simple？（）

[单项选择题]The tag handler for n：recurse extends SimpleTagSupport.Assuming an n：recurse tag can either contain an empty body or another n：recurse tag， which strategy allows the tag handler for n：recurse to output the nesting depth of the deepest n：recurse tag？（）  

[单项选择题]A JSP page， current.jsp， is created to display the current weather report. The weather report is contained in a weather.html page that is rewritten every five minutes. Which line， appearing in current.jsp， ensures that the most recent version of weather.html is included whenever current.jsp is referenced？（）

[单项选择题]When using Form Based Authentication， which pair of fields must be used in the login form？（）