The correct answer is The ping command, since it sends ICMP echo requests to the target host and listens for ICMP echo replies. This process allows the administrator to assess if the host is reachable and the round-trip time for the packet. Other commands listed might be used for different purposes; for instance, The traceroute command would show the path taken by packets to reach the destination, The netstat command displays network connections, routing tables, interface statistics, masquerade connections, and multicast memberships, and The nslookup command is used to query the DNS to obtain domain name or IP address mapping.