MK0-201 Question #223: Real Exam Question with Answer & Explanation

You have successfully exploited a remote computer. You now have limited privilege on the remote computer. Your tests have revealed that it is possible to download files from the internet but the size of the files seems to be limited to less than 60K. You would like to escalate your privilege by scanning the internal network and also setup a permanent backdoor that would allow you to return to the compromised host at will. Which of the following tools could be used for such purpose?