Default Telnet Sessions Allowed on a Cisco Switch

I just finished taking a Cisco exam and one of the questions on the exam had to do with the number of default Telnet session allowed to a Cisco switch. I know you only set or configure the “line vty 0 15” interfaces/session to allowed a total of 16 but that was not one of the answers. I choose six because of the my experience seeing the “line vty 0 5” command configured on many a switches.

Any feedback would be greatly appreciated.

-P.S.