Option A, nmap -sn 10.12.1.0/24, will perform a ping scan to discover live hosts on the subnet quickly.
The -sn option specifies a "ping scan" to discover hosts on the network by sending an ICMP echo request (ping) to each IP address in the specified range. This is a quick way to identify which hosts are up and running without performing a full port scan or attempting to connect to any services.
Option B, nmap -sV -A 10.12.1.0/24, is a service and version detection scan with aggressive options, which is not the best option to discover live hosts on the subnet.
Option C, nmap -Pn 10.12.1.0/24, is a scan that disables host discovery, which means it will attempt to scan every IP address in the specified range, regardless of whether or not a host is responding to pings. This is not the best option to discover live hosts on the subnet quickly.
Option D, nmap -sT -p- 10.12.1.0/24, is a TCP connect scan that scans all ports on each host in the specified range, which is not the best option to discover live hosts on the subnet quickly.
A ping scan is used to discover live hosts on a network. The -sn option in Nmap is used to perform a ping scan, which sends an ICMP echo request packet to the host and waits for a response. If the host is live, it will respond with an ICMP echo reply packet. This option performs a simple ping scan without port scan.
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