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 if this were the default, preventing any user interaction or services from running.

Run level 1 (single-user mode) can sometimes be a default for specific maintenance or recovery systems, though not typical for general operation.

Run level 3 (multi-user text mode) is a common default run level for servers, providing a functional system without a graphical environment.

Run level 5 (multi-user graphical mode) is a common default run level for desktop systems, providing a fully functional graphical user interface.

Run level 6 is the reboot state, meaning the system would continuously reboot in a loop if this were the default, never reaching a stable operational state.