Dns forwarding can be set up so that if the dns server that receives the forwarded request cannot resolve the name, then the server that originally forwarded the request attempts to resolve it, which is called

Nonexclusive forwarding

Explanation:

In Nonexclusive forwarding, DNS forwarding is setup so that if the DNS server receiving the forwarded request cannot resolve the name, then the server that originally forwarded the request makes an attempt to resolves it. If that fails, the server sends a request to its designated forwarder.

solution:

this situation is called an ip conflict.

data from a server is sent in small bits called packets. in an ip conflict, some packets will end up in one computer while some other packets will end up in another computer.

so…overall none of the computers get the data as the original message or picture being sent by the server cannot be retrieved with only half the packets. so it will show up as an error.

thus the final answer is d.