What has Blake just accomplished?

Blake is in charge of securing all 20 of his company’s servers. He has enabled hardware and software firewalls, hardened the operating systems, and disabled all unnecessary services on all the servers. Unfortunately, there is proprietary AS400 emulation software that must run on one of the servers that requires the telnet service to function properly. Blake is especially concerned about this since telnet can be a very large security risk in an organization. Blake is concerned about how this particular server might look to an outside attacker so he decides to perform some footprinting, scanning, and penetration tests on the server.Blake telnets into the server and types in the following command:
HEAD / HTTP/1.0
After pressing enter twice, Blake gets the following results:
What has Blake just accomplished?

A.
Downloaded a file to his local computer

B.
Grabbed the banner

C.
Submitted a remote command to crash the server

D.
Poisoned the local DNS cache of the server