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Linux Foundation Certified System Administrator · Linux Foundation
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Option B. /sbin/init is the first program that is usually started, at boot time, by the Linux kernel when using SysV init. The init program is the first process that is started by the kernel when the system boots up. It is responsible for starting and managing system services and daemons at boot time and during system operation. On systems using SysV init, the init program is typically located at /sbin/init. Option A: /lib/init.so is not the first program that is started at boot time by the kernel. It is a shared object file that may be used by other programs, but it is not an executable program itself.
Option C: /etc/rc.d/rcinit is not the first program that is started at boot time by the kernel. It is a script that may be used to perform additional tasks at boot time, but it is not the first program that is started. Option D: /proc/sys/kernel/init is not a program and is not executed by the kernel at boot time. It is a virtual file in the /proc filesystem that can be used to control certain aspects of the kernel's behavior. Option E: /boot/init is not the first program that is started at boot time by the kernel. It is a directory that may contain files used by the boot process, but it is not an executable program itself.
...runs /sbin/init which is process number 1 (PID=1)... https://en.wikipedia.org/wiki/Linux_startup_process#cite_note-oldfield-6