Which router feature, when enabled, computers on the local network automatically discover and communicate with services provided by other computers on the local network?

UPnP (Universal Plug and Play):

Explanation:

UPnP (Universal Plug and Play) is set of that and helps the network devices to each other on the network Devices that can be present on the network domain are computers, points of access, mobiles devices, printers etc.

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.