Which of the following is GRUB Menu Configuration File?

What does GRUB stand for?

Which of the following files defines which services to start?

Which of the following runlevel values is used to halt the Linux operating system?

Which of the following utilities allows a user to control what services should run when entering a
given run level?

Which of the following files contain the information on how init should set up the system in every
run level?

Which of the following run levels runs the system at single user mode?

Which of the following is a configuration file used to configure TCP wrappers?

Which of the following is the parent of all processes in Linux?

Which of the following run levels is officially undefined?