Which command provides information about the Fully Qualified Domain Name (FQDN) stored in the DNS?

The command that provides information about the Fully Qualified Domain Name (FQDN) stored in the DNS is nslookup. This command is specifically designed to query Domain Name System (DNS) servers to obtain mapping information, including the FQDN associated with an IP address or to retrieve the IP address associated with a given FQDN. It can provide detailed information about a domain, such as its corresponding resource records.

While whois can provide domain registration details, including information about the registrant, it does not directly query DNS servers to retrieve FQDN information. Similarly, gethost is not a standard command for retrieving DNS information, and while dig is indeed another command that can query DNS records, the question is looking for the command more commonly associated with querying for FQDN information in a broader context.

Thus, nslookup is the best choice for obtaining specific FQDN information from DNS servers, given its targeted functionality for resolving domain names.