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Which of the following applies when the FCC rules designate the amateur service as a secondary user on a band?

AAmateur stations may only operate during specific hours of the day, while primary users are permitted 24-hour use of the band
BAmateur stations may use the band only during emergencies
CAmateur stations must record the call sign of the primary service station before operating on a frequency assigned to that station
DAmateur stations must not cause harmful interference to primary users and must accept interference from primary users