How can telnet be used to fingerprint a web server?

How can telnet be used to fingerprint a web server?
A . telnet webserverAddress 80HEAD / HTTP/1.0
B . telnet webserverAddress 80PUT / HTTP/1.0
C . telnet webserverAddress 80HEAD / HTTP/2.0
D . telnet webserverAddress 80PUT / HTTP/2.0

View Answer

Answer: A