Under which of the following circumstances are one-way transmissions by an amateur station prohibited?
Announcements of upcoming ham radio operating events
Broadcasting✓Правильный ответ
International Morse Code Practice
Telecommand or transmissions of telemetry
Объяснение
Broadcasting, meaning transmissions intended for the general public, is prohibited outright. The other three are one-way transmissions that the rules specifically permit, so they are not the answer.