Explanation: According to the scenario, you have searched all open ports of the we-are-secure server. Now you want to perform the next information-gathering step, i.e., passive OS fingerprinting. For this, you will use the P0f tool to accomplish the task. P0f is a passive OS fingerprinting tool that is used to identify the operating system of a target host simply by examining captured packets even when the device is behind a packet firewall. It does not generate any additional direct or indirect network traffic. P0f can also be used to gather various information, such as firewall presence, NAT use (for policy enforcement), existence of a load balancer setup, the distance to the remote system and its uptime, etc. Answer: C is incorrect. Nmap is used for active OS fingerprinting. Nmap is a free open-source utility for network exploration and security auditing. It is used to discover computers and services on a computer network, thus creating a “map” of the network. Just like many simple port scanners, Nmap is capable of discovering passive services. In addition, Nmap may be able to determine various details about the remote computers. These include operating system, device type, uptime, software product used to run a service, exact version number of that product, presence of some firewall techniques and, on a local area network, even vendor of the remote network card. Nmap runs on Linux, Microsoft Windows etc.Answer: A is incorrect. SuperScan is a TCP/UDP port scanner. It also works as a ping sweeper and hostname resolver. It can ping a given range of IP addresses and resolve the host name of the remote system.The features of SuperScan are as follows: It scans any port range from a built-in list or any given range. It performs ping scans and port scans using any IP range. It modifies the port list and port descriptions using the built in editor. It connects to any discovered open port using user-specified “helper” applications. It has the transmission speed control utility. Answer: B is incorrect. NBTscan is a scanner that scans IP networks for NetBIOS name information. It sends a NetBIOS status query to each address in a supplied range and lists received information in human readable form. It displays IP address, NetBIOS computer name, logged-in user name and MAC address of each responded host. NBTscan works in the same manner as nbtstat, but it operates on a range of addresses instead of just one.