To answer this question, let's go through each option to understand which languages are vulnerable to Cross-Site Scripting (XSS) attacks:

Option A) Java - Java itself is not vulnerable to XSS attacks. However, if a Java application uses web technologies like servlets, JSP, or JavaServer Faces (JSF), then the vulnerabilities in these technologies can lead to XSS attacks. Therefore, Java can be vulnerable to XSS attacks indirectly.

Option B) ASP.Net - Similar to Java, ASP.Net itself is not vulnerable to XSS attacks. However, if an ASP.Net application does not properly handle user input or output encoding, it can be vulnerable to XSS attacks. Therefore, ASP.Net can be vulnerable to XSS attacks indirectly.

Option C) Perl - Perl itself is not vulnerable to XSS attacks. However, if a Perl application does not properly handle user input or output encoding, it can be vulnerable to XSS attacks. Therefore, Perl can be vulnerable to XSS attacks indirectly.

Option D) All of the above - This option is correct. While the languages themselves (Java, ASP.Net, and Perl) are not directly vulnerable to XSS attacks, the vulnerabilities arise when these languages are used in web applications and proper security measures are not implemented. Therefore, all of the above languages can be vulnerable to XSS attacks indirectly.

The correct answer is D) All of the above. These languages can be vulnerable to XSS attacks when used in web applications that do not handle user input or output encoding properly.