Consider the steps to enable the Pluggable Authentication Module (PAM) to use cgroup rules for a 64-bit system:
1. Install the libcgroup-pam software package.
2. Ensure that the PAM module has been installed and exists: /lib64/security/pam_cgroup.so.
3. Edit the /ets/pam.d/su configuration file and add a line: session optional pam_cgroup.so.
4. Edit the /ets/pam.d/su configuration file and add a line: auth sufficient pam_cgroup.so.
5. Configure /etc/cgconfig.conf.
6. Configure /etc/cgrules.conf.
7. Log out all users that are affected by the cgroup settings in the /etc/cgrules.conf file.
8. Enable and start the cgred service.
9. Reboot the system.
Which option represents the steps in the correct order to enable PAM to use cgroup rules for a logged-in user?