Concept:A bus topology connects all devices to one main communication line, called a backbone cable.
Explanation:In the network shown in figure 1, each node is attached to a single shared cable.
Data sent by one device travels along this central cable in both directions.
All other devices on the network receive the signal, but only the intended device accepts it.
This layout does not form a closed loop, does not use a central hub, and does not connect every device to every other device.
Therefore, the structure matches a bus topology.
Answer:A. bus topology.
