Victor works as a professional Ethical Hacker for SecureEnet Inc. He wants to scan the wireless network of the company. He uses a tool that is a free open-source utility for network exploration. The tool uses raw IP packets to determine the following:

What ports are open on our network systems.

What hosts are available on the network.

Identify unauthorized wireless access points.

What services (application name and version) those hosts are offering.

What operating systems (and OS versions) they are running.

What type of packet filters/firewalls are in use.

Which of the following tools is Victor using?