Question: Why is the passwd command able to modify the /etc/passwd file?

1. The kernel identifies it as one of the names of extended commands.
2. It has the same name as the file it modifies.
3. It has the SUID permission mode and is owned by root.
4. It is a system administration command.

Answer: The correct answer of the above question is Option C:It has the SUID permission mode and is owned by root.