Which two actions are the required steps to prevent: non-root ssh access to the system?
A.
Create the /etc/nologin/login.deny file containing a single line +all
B.
Ensuring that /etc/pam.d/sshd includes: account required pam_nologin.so
C.
Creating the /etc/nologin.allow file containing a single line root
D.
Ensuring that /etc/pam.d/sshd includes: account sufficient pam_nologin.
E.
Creating the /etc/nologin file