Discussion
Which mechanism decides which node transmits when two start together?
Answer: C
Nodes monitor the bus while transmitting and the one whose identifier has a dominant bit where another has recessive wins. The last option describes exactly that scheme, which makes it a correct and fuller statement. The shared behaviour explains why these belong together and the differences explain why both exist. Naming what changes and what stays the same is the reliable route through questions of this shape. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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