Answer:
The correct answer is: Bus Topology.
Step-by-step explanation:
Bus Topology is a network setup where all the computers are connected to a single cable. Servers can connect easily to the network but it implies everyone connected has access to what everybody in the same network is doing. Security options are limited to no-existent under this topology.
In that case, if technicians cannot isolate a virus infection problem, it is the result of working with a bus topology where more than one computer is connected to the same network and every terminal has access to each terminal.