ECCouncil Exam Questions

What is the issue here?

invictus@victim_server:~$ nmap -T4 -0 10.10.0.0/24
TCP/IP fingerprinting (for OS scan) xxxxxxx xxxxxx xxxxxxxxx. QUITTING!
Obviously, it is not going through. What is the issue here?

A.
OS Scan requires root privileges

B.
The nmap syntax is wrong.

C.
The outgoing TCP/IP fingerprinting is blocked by the host firewall

D.
This is a common behavior for a corrupted nmap application