A Linux administrator booted up the server and was presented with a non-GUI terminal. The administrator ran the command systemctl isolate graphical.target and rebooted the system by running systemctl reboot, which fixed the issue. However, the next day the administrator was presented again with a non-GUI terminal. Which of the following is the issue?

A. The administrator did not reboot the server properly.
B. The administrator did not set the default target to basic.target.
C. The administrator did not set the default target to graphical.target.
D. The administrator did not shut down the server properly.