A Linux Server Needs to Be Accessed, but the Root

Multiple Choice

A Linux server needs to be accessed, but the root password is not available. Which of the following would BEST allow an administrator to regain access and set a new known password at the same time?

A) Boot into single-user mode and reset the password via the passwd command. Boot into single-user mode and reset the password via the passwd command.
B) Boot into single-user mode and reset the password by editing the /etc/passwd file. Boot into single-user mode and reset the password by editing the /etc/passwd file.
C) Boot into single-user mode and reset the password by editing the /etc/shadow file. /etc/shadow
D) Boot into single-user mode and reset the password via the chage command. chage