[CentOS] why does "rescue" mode bring me to runlevel 5 (multi-user target)?

  finishing a week of teaching a comptia linux+ class off of centos
7.4 and wanted to demo how to boot to "rescue" mode, so i rebooted,
selected "rescue" mode at grub menu, which still booted to full
multiuser, graphical mode. what am i doing wrong? or is this a dumb
question?

rday

-- 

========================================================================
Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
========================================================================