Option B- A single point of failure (the backbone cable) can bring down the entire network.
Option C: - which is a ring has ways to bypass failed devices, reducing the risk of total network failure.
The local area network (LAN) physical layout subject to the greatest risk of failure if one device fails is the Bus network (option B). In a Bus network, all devices are connected along a single communication line. If any device or the communication line itself fails, it can disrupt the entire network's functionality. Other devices on the network won't be able to communicate properly if the main communication line is disrupted.
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