Question Pool -- Category T1E

Besides normal identification, what else must a US station do when sending third-party communications internationally?
A.
The US station must transmit its own call sign at the beginning of each communication, and at least every ten minutes after that
B.
The US station must transmit both call signs at the end of each communication
C.
The US station must transmit its own call sign at the beginning of each communication, and at least every five minutes after that
D.
Each station must transmit its own call sign at the end of each transmission, and at least every five minutes after that

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