An attacker tries to do banner grabbing on a remote web server and executes the following command.

Service detection performed. Please report any incorrect results at http://nmap.org/submit/.
Nmap done: 1 IP address (1 host up) scanned in 6.42 seconds

What did the hacker accomplish?


A. nmap can't retrieve the version number of any running remote service.
B. The hacker successfully completed the banner grabbing.
C. The hacker should've used nmap -O host.domain.com.
D. The hacker failed to do banner grabbing as he didn't get the version of the Apache web server.