A DNS server is successfully providing information related to zones for which it is authoritative. A problem occurs when it attempts to resolve addresses in zones for which it is not authoritative. What is a possible cause of this problem?
The server has no /etc/resolv.conf file.
The server does NOT support a .com domain.
The server has only a single Ethernet interface.
The server has no knowledge of the root level servers.
The server is NOT authoritative for any reverse domains.