Which run levels should never be declared as the default run level when using SysV init? (Choose TWO correct answers.)

Run level 0 is the halt state, meaning the system would immediately shut down after starting, making it unusable.

Run level 1 is single-user mode, which is sometimes used as a default for specific recovery scenarios, although typically not for production.

Run level 3 is multi-user mode with text-based login, which is a common and perfectly valid default run level.

Run level 5 is multi-user mode with a graphical login, which is also a common and valid default run level for desktop systems.

Run level 6 is the reboot state, meaning the system would continuously reboot in an endless loop, preventing it from ever fully starting.