On most modern Linux distributions, which program runs as process ID 1 and starts the rest of user space?
Correct answer C. systemd
Explanation
The kernel starts one user-space program as PID 1, traditionally called init; on most current distributions this is systemd, which brings up services and also adopts orphaned processes. bash is a shell, cron runs scheduled jobs, and sshd is the SSH server, all started later by the init system. If PID 1 exits, the kernel panics.
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