Question Pool -- Category T1F

If the FCC rules say that the amateur service is a secondary user of a frequency band, and another service is a primary user, what does this mean?
A.
Nothing special; all users of a frequency band have equal rights to operate
B.
Amateurs are only allowed to use the frequency band during emergencies
C.
Amateurs are allowed to use the frequency band only if they do not cause harmful interference to primary users
D.
Amateurs must increase transmitter power to overcome any interference caused by primary users

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