Under which of the following circumstances are one-way transmissions by an amateur station prohibited?

In amateur radio, "broadcasting" is specifically defined as transmitting communications intended for reception by the general public. The FCC strictly prohibits broadcasting on amateur bands, as the service is intended for two-way communications between licensed amateurs, not for acting like a commercial radio station. While one-way transmissions are generally restricted, there are specific exemptions allowed by the FCC. These include Morse code practice, telemetry, telecommand, and information bulletins directed strictly to other amateurs, such as announcements of upcoming ham radio events.