An administrator completed the configuration of the in-addr.arpa zone files for an organization. Which of the following commands should the administrator use to verify the configuration is working…

The `host in-add.arpa` command attempts to resolve the hostname "in-add.arpa" (which is incorrect, it should be `in-addr.arpa`) and would not perform a reverse DNS lookup for a specific IP address.

The `dig -x 192.168.1.100` command performs a reverse DNS lookup, querying for the PTR (pointer) record associated with the IP address 192.168.1.100. This is precisely how you verify that the `in-addr.arpa` zone files, which manage reverse DNS, are correctly configured and resolving IP addresses to hostnames.

The `tracepath -n 192.168.1.100` command traces the network path to an IP address and determines the MTU, but it does not perform a reverse DNS lookup or verify `in-addr.arpa` zone configurations.