James is a black hat hacker employed as an authorized officer at Apple. He has credentials and signed a non$-$disclosure agreement to perform advanced penetration testing on the iOS $6\mathrm{.}1\mathrm{.}6$ operating system, and has already gained low$-$level access to the mobile device using a backdoor. Which of the following actions should James take to design$/$create his own custom firmware to exploit underlying vulnerabilities and gain a higher level of access to a UNIX shell with root privileges, essentially allowing them to do anything on the device?

Group of answer choices

Copy the source code of the open$-$source BlackArch tool and build custom software from it

Clone and inherit the source code of the open$-$source software $"$P$0$sixspwn"

Copy the source code of open$-$source Mimikatz and build custom software from it

Clone and inherit the source code of the open$-$source software "Pwnage"