B is correct. You can try it your self: open terminal (for Debian-based distributives) and you will see $ the end of the line (regular user), then write sudo -i (it will switch you to root user), hit Enter, input your password and notice that $ changed to #, what means that you're operating as root user now
B. #
In a shell prompt, the "#" symbol indicates that the shell is running with root privileges. This is often referred to as the "root prompt" or "superuser prompt," and it signifies that the user has administrative privileges and can execute commands with higher system access.
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