Which service, tool or command provides information about administrators, domain name servers, additional domains and physical locations?

A.
Whois

B.
Ping scanner

C.
Host

D.
Traceroute

Explanation:

The WHOIS command is used to find out information about the Primary and Secondary name servers and zones of the organization. Information about the zone administrators can be exposed using this command.
Incorrect Answers:
B: The ping scanner is used to determine which IP addresses are used in a network by pinging each possible IP address and seeing which nodes provide a response. It does not identify what kind of server responded, and does not have the ability by itself to get information about the domain structure. At best it can map the network.
C: The host command provides IP to Name and Name to IP address mapping. It provides a TCP/IP mapping of addresses, not any DNS information.
D: Traceroute (Tracert in Windows NT) uses ICMP to map a network path. It does not provide DNS information, although it might provide the fully qualified DNS name of the zone for the IP addresss – if reverse lookup is defined. For an IP to name mapping, you would need to know the host name in advance, and these functions are not provided as part of the ICMP commands themselves. Information of administrators and other domains would not be exposed using this command.