A _____ topology uses a single connection to connect all devices together.

Network topology describes the pattern in which devices are connected to each other. Two very different connection patterns are relevant here: a single shared (multipoint) medium, where every device taps into exactly the same physical line at once, and point-to-point links, where each individual connection joins exactly two devices.

A bus topology attaches every device to one common backbone cable. Because that one cable carries the signal for every device, only a single physical connection is needed to link all of them together — which is exactly what the question describes.

Contrast this with the other topologies listed:

• Star — every device has its own dedicated link to a central hub or switch, so linking n devices needs n separate connections, not one shared connection.

• Ring — each device is joined only to its two immediate neighbours by an individual point-to-point link; the loop is really a chain of separate links (each carrying, receiving, and regenerating the signal device by device), not one line that every device shares simultaneously. So a ring does not satisfy 'a single connection' either, even though the overall shape is a closed loop.

• Since exactly one of the listed patterns — the single shared backbone — matches the description, 'more than one' and 'none of the above' cannot be correct.

So the topology being described is bus.