An organization has a website with a guest book feature, where visitors to the web site can input their names and comments about the organization. each time the guest book web page loads, a message box is prompted with the message "you have been p0wnd" followed by redirection to a different website. analysis reveals that the no input validation or output encoding is being performed in the web application. this is the basis for the following type of attack? a. denial of serviceb. cross-site scripting (xss)c. malicious file executiond. injection flaws