If you take a look around, you'll see that we have different forums for different topics. This one is for Servlet questions.
I'll move this to our Sockets and Internet Protocols forum for you.
Also, be aware, that multiple choice questions look a lot to us to be homework assignments or test questions. We don't answer homework questions here. Why don't you tell us which you think the answer is and why. If you're off, someone might point you in the right direction. See: http://faq.javaranch.com/java/DoYourOwnHomework for more information.