Exam XK0-005 topic 1 question 93 discussion

he systemctl isolate command switches the system to the specified target. In this case, graphical.target starts all the services required for graphical mode (GUI) and stops services that are not needed in this mode. It does not change the default runlevel, meaning the system will revert to its original default target upon the next reboot unless you change it using systemctl set-default.

Is it suppose to be A?

System V runlevel (Purpose) runlevel 0 - (for System shutdown) runlevel1 (for Single-user mode) runlevel2 (for Local multiuser without remote network) runlevel3 (for Full multiuser with network) runlevel4 (for Unused/User-defined) runlevel5 (for Full multiuser with network and display manager) runlevel6 (for System reboot)

A runlevel is an operating state on a Unix and Unix-based operating system that is preset on the Linux-based system. Runlevels are numbered from zero to six. Runlevels determine which programs can execute after the OS boots up. The runlevel defines the state of the machine after boot. Systems administrators set the default runlevel of a system according to their needs, or use the runlevel command to find out the machine's current runlevel to assess a system. Runlevel 0 shuts down the system Runlevel 1 single-user mode Runlevel 2 multi-user mode without networking Runlevel 3 multi-user mode with networking Runlevel 4 user-definable Runlevel 5 multi-user mode with networking Runlevel 6 reboots the system to restart it