Which topology shares a single backbone wire among all the nodes, making it cheap and easy to maintain?

1. In a bus topology, every device connects to one shared transmission medium. 2. A single backbone wire called the bus is shared among the nodes. 3. Sharing one wire makes it cheaper and easier to maintain than the alternatives. 4. The cost is reliability: both ring and bus topologies are considered less secure and less reliable. 5. Mesh needs the most cable, star needs a central device, and tree combines several basic topologies. _Source: NCERT Computer Science Class 12, Ch 10 'Computer Networks', S10.5.3 Bus Topology_