How can telnet be used to fingerprint a web server?

How can telnet be used to fingerprint a web server?

A.
telnet webserverAddress 80
HEAD / HTTP/1.0

B.
telnet webserverAddress 80
PUT / HTTP/1.0

C.
telnet webserverAddress 80
HEAD / HTTP/2.0

D.
telnet webserverAddress 80
PUT / HTTP/2.0