11.
Which of the following is true about JSP implicit objects?

12.
What is the purpose of the `javax.servlet.jsp.PageContext` object in JSP?

14.
What is the purpose of the `javax.servlet.jsp.JspException` class in JSP?

15.
What does the term "JSP tag" refer to in JavaServer Pages?

16.
What is the purpose of the `` tag in JSTL (JavaServer Pages Standard Tag Library)?

17.
In Java web applications, what is the purpose of the `HttpSessionListener` interface?

20.
In JSP, what is the purpose of the `` tag in JSTL (JavaServer Pages Standard Tag Library)?