Which of the following conditions require a licensed amateur radio operator to take specific steps to avoid harmful interference to other users or facilities?
When operating within one mile of an FCC Monitoring Station
When using a band where the Amateur Service is secondary
When a station is transmitting spread spectrum emissions
All these choices are correct✓Bonne réponse
Explication
Each of the three situations carries its own duty in the rules: proximity to an FCC monitoring facility, secondary status on a shared band, and spread spectrum, which must yield to every other authorized emission. Since all three appear, the combined choice is the correct one.