Why is the order of check-in important on a net, and how should a station handle being moved to the back of the queue if a critical message arrives?

• A. Check-in order has no impact on efficiency.
• B. Critical messages should be ignored until the end.
• C. The station should switch to a different frequency.
• D. It ensures fairness and efficient traffic handling; If critical traffic arises, NCS can interrupt and adjust the queue or preempt.

Answer: (D)