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Option A. 0 and Option E. 6 should never be declared as the default run level when using SysV init.
Option A: Runlevel 0 is used to halt the system. It is not appropriate to use it as the default run level because the system will not be able to boot up.
Option B: Runlevel 1 is used to boot the system into single-user mode, which is a minimal environment used for maintenance tasks. It is not appropriate to use it as the default run level because the system will not be fully functional.
Option C: Runlevel 3 is used to boot the system into multi-user mode with networking, which is a normal operating environment for most systems. It is appropriate to use it as the default run level.
Option D: Runlevel 5 is used to boot the system into multi-user mode with networking and a graphical user interface (GUI). It is appropriate to use as the default run level on systems that are intended to run a GUI.
Option E: Runlevel 6 is used to reboot the system. It is not appropriate to use it as the default run level because the system will not be able to boot up.
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