Study G3C10 - Hamboozler

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Which of the following might be an indication that signals heard on the HF bands are being received via scatter propagation?

Select	Answer
A	The signal is heard on a frequency above the maximum usable frequency
B	The communication is during a sunspot maximum
C	The signal is heard on a frequency below the maximum usable frequency
D	The communication is during a sudden ionospheric disturbance