An emergency organization combining amateur radio and citizens band operators and frequencies
An international radio experimentation society
A radio contest held in a short period, sometimes called a “sprint”
An FCC Part 97 amateur radio service for civil defense communications during national emergencies✓Правильный ответ
Объяснение
RACES is a service defined in the FCC rules for civil defense communications, operated with amateur stations under the direction of a civil defense organization. It does not involve citizens band, is not a contest, and is not a society.