Which first step must a client perform to connect to an internal host when the hostname is known, but the IP address is unknown?
A. The client sends the host name in a DNS reply to a DNS server, and the DNS server responds with the host IP address
B. The client exchanges IP address information with a DNS server on the same LAN
C. The client looks up the hostname in the ARP table to determine the IP address
D. The client sends the host name in a DNS request to a DNS server, and the DNS server responds with the host IP address.
