You are tasked with scanning across the network space 192.168.2.x and identifying what operating systems are presently running. Select the correct tool and command-line switch necessary to determine what operating systems are running on that subnet.
A. nikto -Version 192.168.2.0
B. nmap -O 192.168.2.0/24
C. syslog -network 192.168.2.0-192.168.2.254
D. netstat -a 192.168.2.0 /24