While testing the company's web applications, a tester attempts to insert the following test script into the search area on the company's web site:
<script>alert(" Testing Testing Testing ")</script>
Afterwards, when the tester presses the search button, a pop-up box appears on the screen with the text: "Testing Testing Testing". Which vulnerability has been detected in the web application?


A. Buffer overflow
B. Cross-site request forgery
C. Distributed denial of service
D. Cross-site scripting