Answer: Option A
A Bus topology is a type of network topology where all the devices are connected to a single central cable, called a bus. This cable acts as the backbone for the entire network, and all the devices are connected to it through terminators at either end. In a Bus topology, all the data that is transmitted from one device is sent to all other devices, which means that all the devices are connected in parallel.
A broken cable in a Bus topology can result in the entire network going down, because the cable acts as a single point of failure. If the cable is damaged or disconnected, all the devices that are connected to it will be unable to communicate with each other. This is because the data that is transmitted from one device will not be able to reach its destination.
Here is a summary of the key points in bullet form:

• Bus topology is a type of network topology where all the devices are connected to a single central cable.
• The cable acts as the backbone for the entire network.
• In a Bus topology, all the data that is transmitted from one device is sent to all other devices.
• A broken cable in a Bus topology can result in the entire network going down.
• The cable acts as a single point of failure, and if it is damaged or disconnected, all the devices that are connected to it will be unable to communicate with each other.

In conclusion, because a broken cable in a Bus topology can result in the entire network going down, the correct answer is option A, "Bus."