Refer to the exhibit. What is the significance of the asterisk (*) in the exhibited output?

Refer to the exhibit. What is the significance of the asterisk (*) in the exhibited output?
An asterisk designates that the file system has at least one file that uses that file system.
The asterisk designates which file system is the default file system.
An asterisk indicates that the file system is bootable.
The asterisk shows which file system was used to boot the system.